Lieberman: Dems won't win with slide to left
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Former Sen. Joe Lieberman (I-Conn.) argues the Democratic Party will not win elections if the liberal wing of the party takes over.

"Here is my fear about the future of the Democratic Party. In a way, relatively speaking, Hillary ClintonHillary Diane Rodham ClintonGOP senator says idea that Ukraine interfered in US election is 'not a conspiracy theory' Cotton: Democrats are 'upset that their witnesses haven't said what they want them to say' Trump's troubles won't end with a Senate acquittal MORE was representative of ... center-left of the Democratic Party, not the pure left," Lieberman said in a radio interview with John Catsimatidis on Sunday.

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"Now I think there will be a real attempt by the left-left of the Democratic Party to take over the party, and I don't think that's the way to go to make it an effective party," he continued.

"It's certainly not the party that I got drawn to ... it's not the party that I worked so hard for when Bill ClintonWilliam (Bill) Jefferson ClintonFox News poll: Half of Americans say Trump should be convicted and removed Sunday shows - Spotlight shifts to Trump tweet, Senate trial witnesses Fox's Wallace confronts Dershowitz with clip arguing crime not necessary for impeachment MORE was president and it's not going to be a winning party."

Democrats have been grappling with the future of their party following Donald TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE's upset win over Hillary Clinton last month. Republicans also maintained their majorities in both the House and Senate.

Lieberman, a former Democrat who served as the party's 2000 vice presidential nominee, expressed hope that incoming Senate Democratic Leader Charles SchumerCharles (Chuck) Ellis SchumerBolton book alleges Trump tied Ukraine aid freeze to Biden investigations: NYT Trump legal team offers brisk opening defense of president Impeachment has been a dud for Democrats MORE (D-N.Y.) facilitates compromise with Republicans.

Lieberman stressed the importance of political cooperation between both parties while warning about the danger of going "back to the extremes."

"To me, both parties better watch out not to go back to the extremes — left and right — and not working with each other. I think that the public really wants both parties to get together, work together and solve some of the problems of our country, make the future better," he said.