We will have traded one NE Rino (Chaffee) for another...
The positive difference is that Lieberman understands the issues in the war on terror, including the battlefront in Iraq. Also, it's not a zero sum game. With Chaffee and Lieberman in office in the last Senate you had two liberals, one of whom understood the WOT. Now the really bad actor, Chaffee, is gone and Lieberman is moving towards goodness.
The trend is our friend.
Better, far far better, to have the majority. If it includes RINO's.......so be it!