The problem for Snowe, if anything, is that though Democrats like her, they think she's best situated in the GOP. That sets up a hypothetical scenario in 2012 where conservative Republicans run her out of the party, leaving her to run...as an independent. "[H]er chances of being nominated again as a Republican are slim if she gets a half viable challenge from the right," writes Tom Jensen of PPP.
That's not out of the question.
The irony is that these numbers closely mimic a similar poll conducted last November, when Snowe's health care vote was still somewhat in play. Since then she's been less apt to work with Democrats (though she did support financial reform) and yet she hasn't ingratiated herself with her own party.