Businessman Tom Wolf won the Democratic nomination for governor in Pennsylvania Tuesday, easily besting three other candidates including Rep. Allyson Schwartz.

Wolf will now advance to a November showdown against Gov. Tom Corbett (R), regarded by many observers as the most vulnerable governor up for reelection. Corbett is struggling in the polls.

The Associated Press called the race for Wolf with just 14 percent of precincts reporting. Wolf had 55 percent, leading Schwartz (23 percent), state Treasurer Rob McCord (15 percent) and former state environmental secretary Katie McGinty (7 percent).

Wolf is running as a technocrat and an outsider. He poured $10 million of his own money into his bid.

If Wolf defeats Corbett this fall, Corbett will be the first governor to lose reelection in Pennsylvania's history.