Newark Mayor Cory Booker (D) will explore a run for the Senate in 2014 and will not pursue a bid for governor next year, he announced in a video on Thursday morning.

Booker’s decision will apply new pressure on Sen. Frank Lautenberg (D) to announce whether he will run for reelection and spares Gov. Chris Christie (R) a 2013 matchup against a top potential challenger. 

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