Pennsylvania’s lieutenant governor on Monday formally launched a run for the U.S. Senate, eying a seat being vacated by a Republican. Democrat John Fetterman in an announcement video said he would “fight not for one part of Pennsylvania, not for one party of Pennsylvania, but for one Pennsylvania.” “I’m running for the United States Senate for the same reason I ran for lieutenant governor in 2018 and mayor of Braddock 16 years ago, because I believe in a set of core truths,” he said in a written statement. Fetterman, 51, has not held national office before. He began serving as Pennsylvania’s lieutenant governor in 2019. Fetterman immediately indicated he would join fellow Democrats in pushing for the abolition of the filibuster if elected. He also said he would push for stronger healthcare, raising the minimum wage to $15 an hour, and relaxing laws against marijuana. “To get those kind of important …