Because as awful as Democrats can be, our supporters do not condone this kind of behavior observed at Mitt Romney’s Lancaster, Ohio rally:

I’ve mentioned many times just how disappointing the choice between a neo-liberal Rockefeller Republican and a leveraged buyout specialist beholden to theocratic batshitloonitarians and recidivist segregationists is.
It’s also not a difficult choice to make.
It’s also why there isn’t even any room for a moderate leftish pole on the political landscape.
