6. Ben Nelson D-Neb. – Nelson is acting like somebody who plans to run for re-election. He's been busy fundraising ($1.4 million in the bank as of Sept. 30) and staking out positions that put him at odds with his party but, theoretically, play better in Nebraska. But Nebraska is a strongly Republican state and Nelson will pay a high price for one key vote where he did toe his party's line: in favor of the health care bill. If the race looks hopeless, he may opt for a smoother exit.
7. Herb Kohl D-Wisc. – Kohl, 75, is one of the richest Senators, and one of the quietest. He's given no indication yet whether he plans to run for re-election or devote more time to the Milwaukee Bucks basketball team, which he owns.