By Susan Page | USA TODAY
50 days to go.
After a campaign that started more than a year ago, nearly every American already has formed an opinion of the presidential contenders, millions of dollars in TV ads have been aired, and early voting in some states has begun. But there’s still plenty of time for some sort of development, deliberate or out-of-the-blue, that could alter the trajectory of an unpredictable contest — especially one that has tightened to the margin-of-error between Hillary Clinton and Donald Trump.
