Donald Trump is expected to be the Republican candidate for the U.S. presidency.
Julian Zelizer says a Trump win could spell the death knell for American democracy. He says the danger of a Trump victory sliding the United States toward dictatorship is real. Zelizer: Democrats have time to look for a more convincing candidate than Donald Trump. The four criminal cases against Trump have damaged his approval ratings among independent and undecided voters, but it is only possible that the case will go to trial before the election.