PBS News Weekend 
Season 6, Episode 34 of 99
Even if Hillary Clinton wins the White House, she could have a hard time on Capitol Hill, if Republicans continue to control the House of Representatives and Senate. But Republicans are defending 24 Senate seats in this election, and if the Democrats flip only four of them, they'll regain the majority. One of the most vulnerable Republican incumbents is Sen. Pat Toomey of Pennsylvania. NewsHour Weekend Special Correspondent Jeff Greenfield went to the Keystone State to look at Toomey's challenge to win a second term and the dynamic of being on the same ballot as Donald Trump.
