Donald Trump’s running mate, Sen. J.D. Vance (R-OH), officially became a 2020 election denier Wednesday, a fact Transportation Secretary Pete Buttigieg criticized as “shameful” and a political mistake. “First of all it’s wrong, of course Donald Trump lost,” Buttigieg told CNN anchor Erin Burnett on Wednesday night. “And I think he knows that. I think he’s lying. I also think it’s a mistake politically because voters have a dim view of election deniers.” Buttigieg, who appeared on “OutFront” in his official capacity as a Harris surrogate, noted Vance has tried “to avoid officially becoming an e…