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Excerpt of New York Times/YouGov July 2014 polling results

A sampling of YouGov's closest Senate polls

Internet polling has been picking up steam over the past decade, and on Sunday, CBS and The New York Times brought it further into the mainstream: They partnered with British pollster YouGov to conduct polls of every single Senate and gubernatorial race in the country. This gives us a far more comprehensive snapshot of the electoral landscape than we usually get—one based on an unusually large panel of more than 100,000 respondents nationwide, but one that also comes with question marks.

As for the results? Well, let's just say Republicans will uncork some bottles of champagne if these results come to pass.

In Senate races, Republican candidates are ahead in Georgia and Kentucky, the two states Democrats are targeting (by 5 percent in the former, 6 percent in the latter). More importantly, Republicans lead in eight Democratic-held states, though in four of them the margin is just 1 percent: Michigan, Iowa, North Carolina and Louisiana. In the four others, Republicans are further ahead: 4 percent in Arkansas, 8 percent in West Virginia, 16 in Montana, and 27 percent in South Dakota. That's two more seats than they need to win back control of the Senate.

Other incumbent Democrats do come up ahead, though. Mark Udall is up by 4 percent in Colorado, Jeanne Shaheen is ahead of Scott Brown by double digits in New Hampshire, and Alaska's Mark Begich is up either 2 percent or 12 percent, depending on which Republican he faces.

But the best news for the GOP may actually be how well its incumbent governors perform. Kansas's Sam Brownback, in huge trouble in every recent poll, is ahead here by a whopping 13 percent. The same goes for Georgia's Nathan Deal, up a dominant 9 percent, and Florida's Rick Scott, up 6 percent. Ohio's John Kasich is up 6 percent, while Michigan's Rick Snyder and Wisconsin's Scott Walker are up by a more more modest 3 and 2 percent, respectively. By contrast, in rarely polled Connecticut, Democratic Gov. Dan Malloy finds himself in a hole, down 7 percent in a rematch of his 2010 contest.

But there's much more to this polling than the toplines. Indeed, there are a number of issues with YouGov's data and methodology that require serious scrutiny, so we've got lots more analysis after the jump.

Taken individually, few of these polls stick out as outliers. Kansas does stick, and arguably so does Florida, where YouGov gives Rick Scott his biggest lead yet in a nonpartisan poll. And the results in Michigan, North Carolina and Montana's Senate races buck recent trends that had shown improvements for Democrats. In general, though, YouGov's distance from the polling averages is generally plausible.

But when these polls are taken together, it's striking that in almost every case the results are rosier for the GOP than what other polls are suggesting. In seven of the 9 tightest Senate races, Republican candidates are ahead by more than the Huffington Post's Pollster average—in many cases (such as in Michigan and North Carolina) significantly.

Add to that a collection of implausibly tight results in states where Democratic incumbents have otherwise been cruising: Mark Warner's 10 percent lead in Virginia, Dick Durbin's 8 percent lead in Illinois, and Cory Booker's 7 percent lead in New Jersey are all about half of their current average margins.

There's precedent for this: In 2012, the margin of YouGov's final polls favored Republicans by an average 5 points, including large errors in competitive races in Nevada, Wisconsin, Connecticut, and Virginia—all in the GOP's favor.

At the very least, that means that these polls are at the Republican-friendly end of the spectrum of plausibility. But it also does raise some methodological questions, some of which the Times's Nate Cohn addresses.

At the top of the list is the sample's composition. Cohn observes that only 81 percent of Americans use the Internet and that those who don't "tend to be less educated, less affluent and more likely to be Hispanic or over age 65." And there's no doubt that YouGov had trouble reaching nonwhite respondents: Only 6 percent of its Michigan respondents are black (as opposed to 16 percent of the 2012 electorate).

Now, that's only the unweighted share of African-American respondents. YouGov attempted to correct this by weighting, giving smaller samples of under-represented populations larger weight in the final results. Problems, however, remain.

For one, YouGov must guess the electorate's composition, which means that it may underestimate minority voters. (And YouGov made it hard to assess their decisions, since the crosstabs don't specify the samples' weighted composition.) For another, upweighting a group to more than double its original size can wreak havoc on the final results. Small sub-samples can generate bizarre results, which get magnified during the weighting process.

That affected YouGov's measurement of the non-white vote in 2012, and it may have done so again this time. Michigan's two statewide Democratic candidates get just 69 and 57 percent of African-American respondents' vote, for instance. And Dana Houle notes that most of the races in which Democrats saw favorable results in this batch of polling (Alaska, Minnesota, and New Hampshire) are in overwhelmingly white states, i.e., those states in which Democrats are less reliant on harder-to-measure non-white voters.

But what really makes these YouGov polls seem particularly sloppy is that they did not include any notable third-party candidates.

Sure, third-party candidates often poll higher than they end up getting. But how in the world could they not include Eliot Cutler in Maine's Governor race, an independent who took 36 percent in the 2010 election (17 percent more than the Democratic candidate), and when his presence on the ballot this year is the only reason the election is competitive in the first place? Democrat Mike Michaud leads the two-way match-up against Republican Governor LePage by 13 percent, but this poll is utterly meaningless without Cutler.

And how can they not include the Libertarians running in Georgia when a huge question in these races is whether the general election will go to a runoff? How can they not include former Sen. Larry Pressler, whose candidacy is a key factor that could make South Dakota's Senate contest much tighter than expected? These are glaring omissions.

Questions still remain as to how reliable Internet polling can be, and how attentive these national panels tend to be to state-specific details that matter in close elections. And these specific polls, as we've elaborated above, have issues of their own. But they also do give us an indication of what a realistically bad Election Day would look like for Democrats—and it wouldn't be pretty.

Originally posted to Daily Kos Elections on Mon Jul 28, 2014 at 05:30 AM PDT.

Also republished by Daily Kos.

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