Donald Trump’s choice of Sen. J.D. Vance (R-OH) as his running mate just backfired with President Joe Biden’s shock announcement Sunday, MSNBC’s Rachel Maddow argued. The host said Vance was only picked because Trump thought shoring up conservative support was more necessary to his campaign than winning over undecided voters — because, she said, he saw running against Biden as an easy victory. “He wanted him for governing, not campaigning,” she said.” Want more breaking political news? Click for the latest headlines at Raw Story. She added, “They picked J.D. Vance because they thought they had…