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During the 2008 election, Demissie worked for Hillary ClintonHillary Diane Rodham ClintonDemocrat Katie Porter unseats GOP's Mimi Walters Former Facebook security chief: 'I failed to prepare my employer' on Russian disinformation Rand Paul: Facebook must 'convince conservatives they're not the enemy' MORE in Iowa and Connecticut during the primary, and also as Obama's Ohio get-out-the-vote director during the general. He also served on Chicago Mayor Rahm Emanuel's 2010 campaign and worked as national political director for Organizing for America.

And Demissie has deep connections to the Washington Democratic establishment as well, having worked as an aide to both the Senate and House campaign committees.

He joins former Obama staffers Jeremy Bird and Mitch Stewart, as well as Benenson Strategy Group, Obama's lead pollster, on the Booker team.

Booker will face Reps. Frank Pallone, Rush Holt and state Assembly Speaker Sheila Oliver in the Democratic primary for New Jersey's open Senate seat.