In it, but not of it. TPM DC

Rep. Chris Murphy Launches CT-SEN Campaign, Second Dem In The Race (VIDEO)

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Newscom

[TPM SLIDESHOW: Goodbye, Joe: Lieberman Announces He'll Retire In 2012]

Murphy was first elected in the Democratic wave of 2006, defeating 24-year incumbent Republican Nancy Johnson by a margin of 56%-44%. He was re-elected by 59%-39% in 2008, and by a narrower 54%-46% in the Republican year of 2010.

Two days ago, former Connecticut Secretary of State Susan Bysiewicz got into the race. The next shoe dropped yesterday, when Lieberman officially announced his retirement.