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 ClintonTrump preps conspiracy theory to explain faltering economy The ideological divide on vaping has a clear winner: Smokers Biden struggles to hit it off with millennials 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 ClintonNew data challenges Trump's economic narrative The ideological divide on vaping has a clear winner: Smokers Prince Andrew says he didn't 'witness or suspect' criminal behavior from Epstein 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 TrumpGraham: America must 'accept the pain that comes in standing up to China' Weld 'thrilled' more Republicans are challenging Trump New data challenges Trump's economic narrative 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 SchumerJewish Democratic congresswoman and veteran blasts Trump's 'disloyalty' comments Schumer says Trump encouraging anti-Semites Saagar Enjeti: Biden's latest blunder; Krystal Ball: Did Schumer blow our chance to beat McConnell? 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.