Independent Sen. Joe Lieberman predicted Monday that Democrats will maintain their majority in the Senate, but said he would not take sides in Connecticut's competitive Senate race.

Lieberman, who lost the 2006 Democratic Senate primary to Ned Lamont but still won the general election, said in a speech in the Constitution State that he won't support Democratic Senate nominee Richard Blumenthal or Republican Linda McMahon.

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"I've decided it's better for me to concentrate on being a senator, not get involved in any of the political campaigns in Connecticut this year," Lieberman said, according to the Connecticut Mirror. "That's my decision, and I'm enjoying it."

But the four-term senator, who caucuses with the Democrats, expressed hope that the party would maintain its majority so that he could benefit his state.

"I got elected as an Independent, but I've cast my lot with the Democratic caucus, and so obviously, I hope there is a Democratic majority in the Senate after this election, because this directly relates to my ability to do things for the state," he said.

With a nine-senator gap between Republicans and Democrats in the Senate, the GOP would need to win virtually every competitive race to take the majority. One of the key battleground races is the contest between Blumenthal and McMahon for retiring Sen. Chris Dodd's (D) seat.

A newly released Qunnipiac Poll on Tuesday showed McMahon narrowing Blumenthal's lead to six points. Even though Lieberman's endorsement could help tip the balance either way, he said he would remain undecided.

"Here's where I become an Independent," he said. "I have a feeling now that both parties have let the country down."

Lieberman's political action committee, according to the Mirror, has only given to Senate Democrats this cycle. He has donated to one Republican in Congress, Rep. Pete King (N.Y.).

Despite the fact that he aligned himself with the Democrats after his primary loss, Lieberman has frustrated liberal members of the party during several key policy debates. His primary challenge hinged on his support for the Iraq war, and he riled some in his party during the healthcare debate for opposing the public health insurance option.

Most recently, Lieberman has sided with Republicans in the debate over the expiring Bush tax cuts, pushing for a temporary extension of all the breaks, including those for the highest income earners.

Lieberman has also left open the possibility of running as a Republican when he is up for reelection in 2012, though he has said the prospect is unlikely.