PHILADELPHIA — Pennsylvania’s nationally watched U.S. Senate race between Democratic incumbent Bob Casey Jr. and Republican challenger Dave McCormick was still too close to call as of mid-morning on Wednesday,

Senate Republicans are feeling optimistic they’ll expand their majority to 53 seats next year as Sen. Bob Casey (D) is trailing Republican David McCormick in Pennsylvania by more than 50,000 votes with 95 percent of the vote counted.

Republican Dave McCormick's lead over Democrat Bob Casey is within the 0.5% margin that would trigger another tally.