CBS News signs 2016 Clinton campaign manager Robby Mook as contributor

CBS News signs 2016 Clinton campaign manager Robby Mook as contributor
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CBS News has signed former Hillary ClintonHillary Diane Rodham ClintonGiuliani says 'of course' he asked Ukraine to look into Biden seconds after denying it Sanders hits 1 million donors Democrats will not beat Trump without moderate policy ideas MORE 2016 campaign manager Robby Mook and former 2016 Marco RubioMarco Antonio RubioTrump faces difficult balancing act with reelection campaign Republicans wary of US action on Iran California poll: Biden, Sanders lead Democratic field; Harris takes fifth MORE campaign manager Terry Sullivan as contributors, according to a Thursday announcement by the network.

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Mook "is an experienced political strategist who brings vast insight and knowledge into American politics," CBS said in a statement announcing the hires, while Sullivan is "a seasoned strategist with more than two decades of experience in politics" who has "played a senior role in more than 100 campaigns."

CBS News has undergone several changes in the past year. Former "CBS This Morning" co-host Norah O'Donnell replaced Jeff Glor as "CBS Evening News" anchor, and Susan Zirinsky, a former "48 Hours" executive producer, took the helm as CBS News president, replacing David Rhodes. 

Zirinsky also signed "CBS This Morning" anchor Gayle KingGayle KingWeinstein's attorney says his 'whole life has been ruined': 'He never gets to be Harvey Weinstein ever again' Virginia Lt. Gov. Fairfax files 0 million defamation suit against CBS CBS News signs 2016 Clinton campaign manager Robby Mook as contributor MORE to a new contract earlier this year. 

The signings of Mook and Sullivan come as all major broadcast news organizations continue to add talent and resources to their respective rosters ahead of the 2020 presidential election.