Ned Lamont, who rose to national prominence after defeating Joe Lieberman in the Democratic primary in the 2006 Connecticut race for the US Senate just endorsed Senator Barack Obama.

See this excerpt from Lamont's website:

"It's Time To Change The Game

When I decided to run for Senate, I did so because I deeply believed that the citizens of Connecticut were yearning to see fundamental changes in our politics – changes that would make government work for them again.

Today, with our Presidential primary in Connecticut less than a month away, I am announcing my support of Barack Obama for President because I am convinced that his forward-looking, progressive vision provides the best chance to enact meaningful reforms in the way Washington works."...

http://www.nedlamont.org/

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Btw, Senator Lieberman {of the Independent party or whatever party he belongs to} went on to win that campaign in Connecticut. Lieberman recently endorsed Republican Senator John McCain for US President.