Many Donald Trump supporters think he is a slam dunk to beat Hillary Clinton in the general election. The candidate himself certainly takes this view. But Trump's analysis of current public polls is preposterous. In the RealClearPolitics.com average of recent polls, Trump trails Clinton by 6 points, 47 to 41 percent. Ted Cruz, in contrast, leads Clinton 46 to 45 percent. Ex-candidate Marco Rubio and splinter candidate John Kasich have been running even better. All at least equal the 46 percent that is the lowest percentage won by either party's nominee this century. Against each of them Clinton falls short...
