The bottom is dropping out for Donald Trump. While Trump was never popular outside of his loyal slice of GOP voters, a raft of new polls show his national position hitting new lows, including with groups that are supposed to form his base. America's widespread loathing for Trump puts further pressure on Republican delegates to deny him the nomination in July if he falls short of a majority, a move that would set off an ugly civil war but that some in the party believe would be necessary to stave off generational damage. A collection of recent surveys by Real...