Hillary Clinton surged to a broad advantage against Donald Trump in the latest ABC News/Washington Post poll, capitalizing on Trump’s recent campaign missteps. Two-thirds of Americans see him as biased against groups such as women, minorities or Muslims, and a new high, 64 percent, call Trump unqualified to serve as president. These and other doubts about Trump have produced a sharp 14-point swing in preferences among registered voters, from +2 points for Trump in mid-May, after he clinched the GOP nomination, to +12 points for Clinton now, 51-39 percent. That snaps the race essentially back to where it was in...