Trump

Trump has been trying hard to chase away Republican support. He obviously doesn't like Republicans. Recently he has said he doesn't support Ryan, or McCain and is actively supporting other people for their seats in the upcoming election. McCain and Ryan have halfheartedly supported Trump simply because he is the Republican nominee, as have many other Republicans. They continue to come out and denounce his statements on various issues, including the latest dust up about Mr. and Mrs. Kahn, yet, continue to say he is the only choice to be the next president. Certainly it is a choice of two evils for Republicans, with Hillary being the most evil.
It's the majority of the Republican voters who have put Trump in his position and Republican leadership in their uncomfortable position. Trump is an outsider as a Republican, as much as Sanders was an outsider in the Democratic party. The Republicans chose the outsider, the Democrats did not. That puts Trump at a disadvantage for Republican party unity and getting the most possible votes out of Republicans. Hillary won her party's nomination, but Sander supporters claim they won't vote for her and decades of negative Hillary feelings within the Democratic party towards Hillary means she won't get the most available democratic votes. That negativity towards Hillary from within the Democratic party is why she lost to Obama (an unknown) even though she was considered a shoe in to win the Democratic nomination in 2008.
This will leave the undecided vote (at a high of 20%) to decide who the winner will be. That's one of the only normal facts about this election. The undecided voters often decide who will be president. I doubt a huge democratic voter turnout (which hasn't appeared during the primary's)  can make up that 20% undecided vote. Those undecided voters seem to be in the same quandary,  which candidate is less evil, which candidate do they dislike more.
Democrats are hoping Trump's big mouth will get those undecided voters to go with Hillary, but there is no sign that is happening. The "Teflon Don" has yet to say something that has changed the mind of those undecided voters. The undecided percentage hasn't changed in months. Even the negative comments from Republican leaders about Trump hasn't had an effect on the undecided number. The traditional ideal of what a president should be characteristically doesn't seem to matter. As repulsive as Trump can be, that hasn't changed the undecided voters, yet. Similarly, all the negativity about Hillary hasn't changed that undecided number. These undecided voters will probably not vote, or make up their minds as they vote. Just make a pick, like pin the tail on the donkey. It's a crummy choice in their eyes.
As for me; my State will go big for Hillary, so I probably won't vote. If I was in a State that was close, I would vote for Hillary based only on my repulsion for Trump. I am not a Hillary fan. Good luck with your choice, undecideds.