A conservative columnist laid into former President Donald Trump’s running mate, Sen. J.D. Vance (R-OH), on MSNBC Wednesday for his decision to write a blurb for a book by a far-right extremist who helped generate the “Pizzagate” conspiracy theory. about D.C. politicians sex-trafficking children in the basement of a pizza shop with no basement. There’s no way that Vance didn’t know who he was signing on for, columnist David French argued. “I want to start with this, because I was thinking about the fact that you and I work in a world in which people ask to blurb books,” said anchor Chris Hayes…