Intriguing: Doctor, filmmaker, activist

Sen. Joe Lieberman As an independent, the former Democrat from Connecticut caucuses with his former party's lawmakers, and often drives them crazy. He's playing a pivotal role in negotiations on health care legislation, as he may be the crucial 60th vote needed to pass it. Because of opposition from Lieberman, Senate Democrats are preparing to drop a compromise health care proposal that would allow 55- to 64-year-olds to buy into Medicare .

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