Well, our "left" party instead decided to call Bernie Sanders racist during the primaries and do everything they could, twice, to keep him from winning their primary. So, it's not just racist voting for Trump that does this. The entire political establishment is absolutely terrified of an actual leftist running on the Democratic ticket for president.
Because once every 4 years when Americans actually pay attention to politics for a month or two, they would overwhelmingly vote for a leftist pushing progressive working class policies. No matter how "racist" they are. Racist in this country also have had someone they know experience crippling medical debt.
The 30% of this country that votes for racism and bigotry is the only group of people that actually see their policy positions get passed. The rest of us got garbage healthcare reform, more wars, more police state and surveillance, oh, and a genocide from the "not racist" party.
The racist bigots are the only ones with a lot of motivation to go to the polls. At least they get something for taking time off work to go vote.