Let's turn first to the Senate. Rather than simply dumping every seat that changed hands between the 112th and 113th Congresses into one big chart, I've broken it down into four tables: (1) where a Democrat replaced a Republican; (2) where a Democrat replaced a Democrat; (3) where a Republican replaced a Democrat (which, thanks to a strong Democratic performance in 2012, only happened in one state); and (4) where a Republican replaced a Republican. Note that this includes not just the regularly-scheduled 2012 elections, but also special elections that ensued in the following year (as necessitated by the resignations of John Kerry, Jim DeMint, and John Ensign, and the death of Frank Lautenberg).
First, Democrats who replaced Republicans:
The biggest needle-jump in the Senate, as you probably expected, was the replacement of Scott Brown with Elizabeth Warren. Despite Brown being fairly moderate by Republican standards, Warren is situated on the Senate Democrats' left flank. Compare that with the Maine race, where the relatively moderate Olympia Snowe was replaced by the relatively moderate Angus King, leading to a smaller difference between their DW-Nominate compared to Brown and Warren.
On to Democrats who replaced other Democrats:
You'll notice that replacing Joe Lieberman in Connecticut actually moved the needle further to the left than did the race in Maine, even though control of the seat stayed within the Democratic caucus. That's because freshman Chris Murphy has, in a pleasant surprise, racked up one of the most progressive records in the Senate, even slightly to the left of Warren. On top of that, you'll see that two other freshmen, Ed Markey and Mazie Hirono, also managed to edge out Warren in the standings (though their net change was smaller, since they replaced high-quality Democrats).
Surprisingly, every Senate seat but one that stayed within the Democratic caucus got more progressive (though, for instance, the shift from Kent Conrad to Heidi Heitkamp was barely perceptible). The one that didn't was the transition from Lautenberg to Cory Booker, but it's not as big a change as many people had feared: While Booker leans heavily on bipartisan rhetoric (no doubt with an eye toward the presidency some day), he's turned out so far to be a very reliable vote when it comes down to nuts and bolts.
Now Republicans who replaced Democrats:
The one Democrat who was succeeded by a Republican, Ben Nelson, already had the most conservative score of any member of the Democratic caucus, so that somewhat lessens the impact of his departure.
And finally, Republicans who replaced other Republicans:
In fact, somewhat parallel to Connecticut and Maine above, you'll notice that the Republicans moved the needle to the right almost as far in Texas as they did in Nebraska, even though the Texas seat stayed in Republican hands. That's thanks to Ted Cruz, currently with the third most conservative record in the Senate replacing Kay Bailey Hutchinson, who had the 10th least conservative record in the Senate in 2011-2012. On the other hand, the other Republican-to-Republican switches all wound up moving the needle to the left a little bit, with Dean Heller and Jeff Flake dialing their conservatism down slightly compared to their predecessors.
The House is trickier to talk about, since the 2012 election involved new district lines in most states. In most cases, there's a pretty clear sense of who replaced whom: The district lines stayed similar, and an incumbent either retired or lost. However, in a few states where the map was dramatically redrawn (Arizona, California, Florida, and Ohio in particular), there was enough shuffling around that it's often hard to say who succeeded whom.
My general approach, though, was to designate successors via the fewest number of steps possible. For instance, in California's Central Valley, if you were to go by geographic turf, you might argue that, because Dennis Cardoza retired and Jim Costa moved over to Cardoza's safer seat, that Cardoza was replaced by Costa and Costa's open seat was filled by Republican David Valadao. However, I'm just consolidating that into the path of least resistance: Cardoza was replaced by Valadao.
Similarly, in Palm Beach County, Florida, you could make the case that it was really Lois Frankel who replaced Allen West, who fled to a safer district further north that had been vacated by Tom Rooney, who got an even safer district newly created because of Florida's population growth ... which would mean that Patrick Murphy, who defeated West, replaced Rooney. However, I'm simply consolidating that down to Murphy replacing West, since that was the actual battle fought.
Again, we'll start with the races where Democrats replaced Republicans:
You might remember back in 2012, in the run-up to the election, I engaged in a similar kind of analysis, offering suggestions as to where donors could contribute to help move the needle furthest from right to left. In that post, I proposed that one of the biggest difference makers could be the race in IL-08, where Tammy Duckworth was facing off against one of the House's loudest loudmouths, Joe Walsh.
That was pure speculation, since Duckworth had never held office before and therefore didn't have a DW-Nominate score I could use for comparison. But it turns out that guess was exactly right: Even though Duckworth is a bit right of the Dem caucus's midpoint, her win did move the needle the most, thanks to Walsh's position on the hard right flank of the GOP caucus.
Several other races featuring more progressive Democrats also are near the top of the list, like the unexpected comeback by long-ago ex-Rep. Rick Nolan in MN-08, or the emergence of Mark Takano in CA-41. (Dreier -> Takano is another very convoluted replacement, since they didn't oppose each other. David Dreier simply retired after getting the short end of the stick in redistricting, with the plurality of his constituents now represented by Gloria Negrete McLeod, while Takano's district has its roots in Ken Calvert's old district.)
Moving on to Democrats who replaced other Democrats:
The Democrat -> Democrat chart in the House isn't as lopsided as the one in the Senate: Nearly as many races moved the needle a bit to the right as moved it to the left. The biggest success was the replacement of the Blue Doggish Tim Holden with progressive Matt Cartwright in PA-17, though that has GOP gerrymandering at its roots. The addition of Scranton to this once Republican-leaning rural district (in order to create a Democratic vote sink to bolster all the surrounding Republican seats) made it too blue a seat for Holden—who'd proven invulnerable to whatever the Republicans had thrown at him for two decades—to handle.
However, the loss of a trio of liberal lions in California (Lynne Woolsey to retirement, Bob Filner to the San Diego mayoral race, and Pete Stark to a surprising primary loss) moved the needle decidedly to the right in three solidly blue districts. In at least two of these cases, though, those replacements are something of a win-win anyway, as Filner and Stark revealed themselves to be terrible, terrible persons (Stark over the course of his campaign, and Filner once he was in office as mayor). This shift is somewhat mitigated by the replacement of the often ethically troubled Laura Richardson; she lost a primary mashup with Janice Hahn, but the bulk of her Long Beach-area district is now held by the much cleaner and much more liberal Al Lowenthal.
Tulsi Gabbard taking over for Mazie Hirono in Hawaii also looks like a bit of a disappointment. Although she's undeniably a rising star (and probably still preferable to Mufi Hannemann, whom she defeated in the primary), she seems to put her No Labels-type rhetoric a little more into practice than, say, Cory Booker.
And now to Republicans who replaced Democrats:
The list of Democrats replaced by Republicans is notable in two ways. One, almost all of the Democrats on this list were very much from the conservative end of the caucus. Their defeats and retirements in 2012 almost represented unfinished business from the 2010 GOP wave, and these consecutive election cycles are why the Blue Dogs have dwindled down to such a small part of the overall picture.
And two, it shows what a swath the Republicans managed to cut through North Carolina via redistricting. That gerrymander also accounts for the loss of the one Dem on the list who was putting up a somewhat progressive record: Brad Miller, who simply retired after going from a safely Dem to a safely GOP district, and who has been replaced by the seriously tea-flavored George Holding.
Finally, here are the Republicans who replaced other Republicans:
The list of Republicans replacing Republicans also has some surprises, in that it shows a more nuanced picture of their party, rather than the expected stereotype of a nonstop march to the right. Even here, there are nearly as many replacements where the needle moved left as to the right. In particular, you can see a big shift to the left with the replacement of Ron Paul with a more conventional tea party type, Randy Weber. However, that's equally counterbalanced at the other end with the replacement of an establishment Republican in Kentucky with Thomas Massie, a Paul ally.
(As an aside, this points to the always-puzzling question about vote aggregation and how to consider purity-motivated outliers: Other aggregators, who use only selected votes instead of a Bayesian dragnet, tend to view Paulists as moderates, seeing as how they occasionally vote with the Democrats, albeit for the wrong reasons.)
Lastly, there's one more interesting phenomenon to call to your attention, based on a very small sample: the recent tendency for House members to become more liberal when they move to the Senate. That's probably most dramatically on display with Chris Murphy, who amassed a rather New Dem-ish record in the House while representing Connecticut's swingiest House district. (In fact, while progressives had many concerns in 2012 about his kinda-centrist replacement, Elizabeth Esty, she's racked up a slightly better record in the House.) But on jumping to the Senate (where he now represents a much bluer constituency, in the form of the whole state), Murphy's suddenly one of the most progressive Senators of all, very reminiscent of Kirsten Gillibrand's turnaround after her promotion in New York.
But that same shift has happened to a lesser extent with most of the other Dems who got promoted (Hirono, Heinrich, and even Joe Donnelly), with only Tammy Baldwin moving to the right (and only very slightly so, considering that Wisconsin as a whole is much swingier than her former dark blue district). It even happened with Republican Jeff Flake, who was one of the most conservative members of the House, but who has repositioned himself as a fairly moderate senator, probably in anticipation of Arizona becoming swingier in coming years as its demographics change.
This may also have to do with who's in charge, though: Democrats control the agenda in the Senate, and the fact that the mundane housekeeping bills that dominate the chamber are sponsored by Democrats may help move the overall bulk of everyone's votes to the left, unlike in the GOP-controlled House. If the Republicans do manage to take control of the Senate in 2014, we'll have to see if everybody's numbers in the Senate shift to the right accordingly.
For now, though, progressives can know that on the whole, we don't just have more Democrats in the Senate, we have better ones.
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