Your claim of "nearly 50% of the population" support him needs a source. I put his support at closer to 40% than 50%.
Based on what?
Most of these polls (as of today), put Trump at within a few percentage points of Clinton:
http://projects.fivethirtyeight.com/2016-election-forecast/n...
Trump is on average closer to 40%.
It's erroneous to extrapolate from likely voters to the population at large. Granted that the sentiment of likely voters will line up quite well with the population at large, it's just that a likely voter poll necessarily rejects people who don't give a shit. The people who don't give a shit shouldn't be counted as supporting anything.