2008 looks like it can be another good year for Democrats seeking Senate seats.
More GOP seats than Dem seats will be up. Some of those seem like good targets.
I've seen a few other diaries on this, but thought I'd put my own lengthy thoughts here instead of in a comment.
Let's start with the east.
New Hampshire: Sen. Sununu is now part of an endangered minority. If the GOP puts up a strong Presidential candidate, and Bush's last two years are better than the two that just ended, he might survive. The Dems should think about putting up Gov. Lynch.
Maine: Forget it. Susan Collins isn't going to get beat.
Midwest:
Minnesota: Sen. Coleman is going to have a tough fight. I am not too keen on Al Franken being the challenger, but he's not the only possibility. If Mike Hatch tries for it, or even Hubert H. Humphrey III, there's a reasonable shot.
Nebraska: Sen. Hagel will be re-elected.
Oklahoma: Gov. Henry would be a strong candidate here and might even be able to take the seat from Sen. Inhofe.
Kansas: I doubt Sen. Roberts can be beaten, but if he retires Gov. Sebelius would be a strong candidate.
West:
Colorado: Rep. Mark Udall is going to challenge Sen. Allard and will run for the seat even if Allard retires. If that happens, and the GOP puts up Gov. Owens, it will be a tough fight. If the GOP puts up someone else, then I think Udall will have the edge. I don't see Mayor John Hickenlooper getting into this fight.
Oregon: Sen. Smith is popular. I have heard that Rep. Blumenauer might take him on, but I can't see an urban Portland Democrat doing that well statewide. Of course Ron Wyden got elected in the mid-90s, so who knows?
Alaska: Sen. Stevens won't be beat if he runs again. If he doesn't, then the problem is a lack of credible candidates. Tony Knowles lost to Lisa Murkowski and again to Sara Pallin this year. He's not the answer.
New Mexico: It's hard to imagine Pete Domenici running again. He'll have served six terms and his health isn't too good. If Gov. Richardson could be persuaded to run, I think the Dems win the seat if Pete retires. If Domenici runs again, no go for the Dems. And I don't know who else they'd put up. Patricia Madrid just lost to Heather Wilson in a big D year in a district with a D advantage. Tom Udall isn't too well known, really, and hasn't seemed to express interest.
South:
The only state in play here is Virginia. If Sen. Warner retires, and Mark Warner runs, then it's a Dem pickup. If Sen. Warner doesn't retire, then the race will be tough but a maybe.
I don't see any of the other southern Republican senators being beatable, not least because it's hard to see who could mount a challenge strong enough to overcome the strong GOP bias in the region.
As far as Democrat incumbents go, I don't see any of them being particularly vulnerable. Johnson will have a tough fight in SD, and perhaps Capito challenges Rockefeller in WVa.