State voters in Pennsylvania will have only one chance to see their U.S. Senate candidates in a debate. That comes tonight when Democrat John Fetterman and Republican Mehmet Oz face each other at a Harrisburg TV studio. The hour-long debate will be simulcast on other stations and websites across the state. It’s going to be the only state-wide debate this year as the candidates for governor, Democrat Josh Shapiro and Republican Doug Mastriano, couldn’t come to terms about a debate for themselves.