Bob Casey Jr. faces a well-financed challenge from Republican Dave McCormick in Pennsylvania’s nationally watched U.S. Senate race. While Casey held a lead for much of the campaign, the race tightened in the final days,

Casey v. McCormick tracks as second-most expensive race in the nation in a year where every seat counts in the battle for majority control of the U.S. Senate.

Pennsylvania’s U.S. Senate race between three-term Democratic Sen. Bob Casey and Republican David McCormick will help determine control of the chamber