Pennsylvania’s close U.S. Senate race could determine which party takes control in Washington. Polls are showing incumbent Democrat Bob Casey up by only one to two points over GOP challenger Dave McCormick headed into Election Day. Right now, the Democrats have a one-seat voting majority in the Senate, including the three independents who typically caucus with the party. If Republicans are able to flip that majority, they could create substantial road blocks for Kamala Harris if she takes the White House, or they could give Trump an easy path to implementing policies if he wins another term. Casey has yet to face such a potentially competitive opponent in his 18 years as a senator, with the closest race being his nine-point win in 2012. Dave McCormick is holding an election watch party in Pittsburgh tonight as Casey’s team monitors the results from Scranton.