Sen Joe Lieberman (D-Conn) is never going to win any popularity contests among his party's liberal base -- a fact he seems decidedly unconcerned about despite his 2006 Democratic primary loss to Ned Lamont.

Not only has Lieberman endorsed Sen Susan Collins (R-Maine.) -- one of Democrats' biggest targets in the 2008 cycle -- but he's planning to co-host a fundraiser for her on June 21 in Washington, D.C.