And so we come to this, the final presidential debate of 2016. Some of you may have viewed every showdown of this campaign cycle, starting with last fall's faceoffs. If so, by our math you have spent more than 50 hours — two solid days of your life — watching White House hopefuls argue. But never have the debate stakes been higher than they are tonight. Election Day itself less than three weeks away; this is the last, best chance for Donald Trump and Hillary Clinton to make their case to tens of millions of voters at once. We've had some advance clues about what sort of approach both candidates will gamble on tonight in Las Vegas. Some of our best guesses are below.