Pennsylvania Democrat Bob Casey [D-PA] hopes a visit from President Biden will be a boost for his Senate re-election campaign. The white house says President Biden will hold a campaign event for Casey on Tuesday. The rally will be in Philadelphia, following the president’s stop in Wisconsin. Casey is locked in a tough battle with Republican challenger David McCormick. Flipping Casey’s seat from Blue to Red would be a major victory for Republicans as they seek to regain the Senate majority.