PENNSYLVANIA, USA — The race for Pennsylvania's open U.S. Senate seat between Democratic incumbent Sen. Bob Casey and Republican Dave McCormick is among the nation's most highly contested and expensive races. It could also help determine which party controls the narrowly divided Senate.

Republicans picked up another Senate seat on Thursday, Nov. 7, after previously unseating Democratic incumbents in Ohio and Montana

WASHINGTON — Republican David McCormick cut Democratic Sen. Bob Casey's leads in Philadelphia and its populous suburbs and built leads in the more GOP-leaning parts of the state, foreclosing the incumbent's pathway to victory when The Associated Press called the race.