By Brad Segall

NORRISTOWN, Pa. (CBS) – The most hotly contested Congressional primary in Pennsylvania appears to be in the 13th District where four Democrats are vying for the nomination to succeed Representative Allyson Schwartz.

Half of the district is in Philadelphia, the other half in Montgomery County.

Schwartz decided to step down to run for governor leaving the seat open in January. The race features Marjorie Margolies who served one term in Congress back in the nineties, state lawmakers Brendan Boyle and Daylin Leach and political newcomer Dr. Valerie Arkoosh.

The race has generated millions of dollars in campaign spending, with the candidates making a final push in the weeks leading up to the election in an effort to convince voters.

Margolies rolled out former President Bill Clinton for a TV ad. Her son is married to former first daughter Chelsea.

Boyle is said to have union money and a power base in Philadelphia and Arkoosh picked up the endorsement from the Inquirer newspaper.

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