A single House race can have far-reaching consequences. Alexandria Ocasio-Cortez defeated Joe Crowley, House Democrats Caucus Chairman, and heir apparent to Pelosi, which opened up the leadership to Jeffries. Two cycles later, he's on the cusp of becoming House Democratic Leader. Not bad for someone who ran three times before being elected to the New York State Assembly. In ten years Jeffries rose from the backbench to the top leadership of the House. Winning back the majority will not be easy.