Undecideds virtually always break more than 2-1 for the challenger, which considering Hillary is running as the status quo and Obama's 3rd term, would be Trump. And let's face it, after 30 years of Hillary, if you are "undecided", what you are really saying is "I'm voting for Trump, but won't admit it to the pollster..."
I know it's early, we still have 19 days until election day and a lot can happen. But I'm laying down my final bets:
Trump 47%
Hillary 43%
Other 10%
Trump wins with ~290 in the electoral college...
Would be nice to have a GOP winner with over 50% of the vote, however. Granted, Bill Clinton didn't manage that, but it would be nice.
It will be 4-points. Do the math: 31.8m GOP primary voters @85% participation (probably low, if they voted in primary)= about 27m.
Figure each brings just 1 non primary voter on election day (spouse, friend, GOTV)=54 M, then there are 15m indies in 2012 x .50 (don’t even give Trump ANY extras) and he is at 61.5m already.