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Former Democratic vice presidential candidate and U.S. Sen. Joe Lieberman says he’s not endorsing anyone – Republican or Democrat – for president in November."I'm going to try to stay out of this one," Lieberman told Chris Wallace on "Fox News Sunday." Lieberman, an independent from Connecticut who caucuses with Democrats, famously endorsed his friend Republican John McCain over Barack Obama in the 2008 election.Wallace joked that that endorsement "didn't work out so well the last time.""I'm not running for re-election," Lieberman countered. "I'm enjoying not being involved in the nastiness of campaigning in America these days."Lieberman won’t even say if he would vote for Obama or likely Republican nominee Mitt Romney."This year, when it comes to the presidential election, I'm just going to do what most Americans do: Go in the voting booth on election day and in the privacy of the booth cast my vote," Lieberman added. "This is a very important election. One thing I will say -- it seems obvious from the polling that is going on the whole year -- the American people are very unsettled; they are uneasy about the economy, about the government.""They have changed their mind a lot as this has gone on," Lieberman added. "This is going to be a very close and unpredictable presidential election right down to Election Day."