Republican Sen. JD Vance of Ohio and Democratic Sen. John Fetterman of Pennsylvania.Bill Clark and Tom Williams/CQ-Roll Call via Getty Images Sens. JD Vance and John Fetterman, populists from different parties, worked together on a rail safety bill. Fetterman accused Vance of "silly performance art" over his doomed effort to ban mask mandates. Vance argued his mask crusade isn't distracting from the rail bill, and that he's been building support for it. Two of the Senate's most prominent self-styled populists — each from different parties — are at loggerheads amid the stalled railway safety bill they drafted together.During a sit-down with reporters in Sen.