I'm the underdog,” David McCormick told NewsNation’s Leland Vittert in a one-on-one interview for “On Balance.”

Democratic U.S. Sen. Bob Casey of Pennsylvania and Republican challenger David McCormick have held the first debate in their race for a swing-state seat.

Bob Casey (D) is up 4 points in his Senate reelection bid over Republican rival David McCormick, according to a new survey. The AARP poll found the incumbent Democrat garnering 49 percent support from likely voters to McCormick’s 45 percent,