Sen. Tom Carper of Delaware was seen joining a Senate hearing from a train while not wearing a mask despite President Biden’s executive order mandating masks be worn on public transportation. “Senator Carper is zooming on a train during a hearing,” CSPAN’s Jeremy Art tweeted Wednesday of a Senate hearing on drinking water and wastewater infrastructure. If I'm jumping around, it's because the train is jumping around. I'm not jittery,” Carper, a Democrat, said, adding that it was the first time joining a hearing in such a setting. Some social media users pointed out that Biden signed an executive order...