Tom Wolf has won the Democratic nomination in the race to challenge Pennsylvania Gov. Tom Corbett, the Associated Press reports.
Wolf defeated Rep. Allyson Schwartz, state Treasurer Rob McCord and Katie McGinty, a former secretary of the state's Department of Environmental Protection.
A Quinnipiac University Poll in February found that just 36 percent of respondents approve of Corbett's job performance as governor.
The Huffington Post's Amanda Terkel and Samantha Lachman reported on the four-way Democratic primary on Monday:
Gov. Tom Corbett (R) is considered one of the nation's most vulnerable governors in November, inviting Democrats to scramble for the nomination to unseat him. Businessman Tom Wolf appears to have separated from the rest of the field: Rep. Allyson Schwartz, state Treasurer Rob McCord and Katie McGinty, a former secretary of the state's Department of Environmental Protection, are trailing him by double digits in recent polls. A loss on Tuesday would represent a huge disappointment for Schwartz, who was the perceived front-runner until Wolf began pumping millions into his own campaign to preempt the other candidates on the air across the Keystone State. Wolf's momentum has derived from his positive, biographical ads discussing his leadership of his family business, the nation's largest supplier of kitchen cabinets. Schwartz's television ads have been more policy-oriented, as she has touted her contributions to the Affordable Care Act and Pennsylvania's Children's Health Insurance Program.