OK, I'll start this broad thread about the upcoming 2010 elections off with this snapshot of 7 top Democrats in Washington who are fighting uphill battles for re-election in 2010.
Unlucky 7: Big Dems With Big Problems - FOXNews.com
B. Boxer (Sen. California)
H. Reid (Sen. Nevada)
C. Dodd (Sen. Connecticutt)
J. Murtha (Rep. Pennsylvania)
I. Skelton (Rep. Missouri)
D. Obey (Rep. Wisconsin)
B. Lincoln (Sen. Arkansas)
NONE of these are my personal representatives in DC, so my comments can only be broad and general, but yes, I would pick them as both vulnerable and deserving of the problem.
I gather from the article that not only are they seeing strong competition from within their own parties, but from the Republicans.