US Sen, Joseph Lieberman will announce tomorrow that he is not seeking reelection sources close to the four-term senator have told The Hanging Shad. Lieberman plans to make clear that he is not seeking another term at a formal announcement tomorrow at 12:30 pm at the Stamford Marriot.

Lieberman’s staff has been keeping things very close to the vest. His senate press secretary Erika Masonhall told the Hartford Courant’s Capitol Watch blog, “After many thoughtful conversations with family and friends over the last several months, Senator Lieberman made a decision about his future over the holidays which he plans to announce on Wednesday.”

However, sources close to Lieberman tell The Hanging Shad it’s apparent to the senator that he doesn’t have the base to run. His approval rating in the last Quinnipiac poll was 40%. He angered many in the Democratic establishment by speaking at the 2008 Republican National Convention and by campaigning for Republican nominee John McCain. And with 2010 US Senate Republican nominee Linda McMahon waiting in the wings for another try, Lieberman would not be able to put together the coalition of Democrats, Republicans and Independents with which he won in 2006 after losing the Democratic primary to Ned Lamont.

Lieberman’s announcement comes just a day after former state Secretary of State Susan Bysiewicz announced that she is seeking the Democratic nomination for the seat Lieberman now holds.