Do not let Trump become President of the United States
If you are a Trump supporter, then the rest of this entry is not for you. I also don't understand what you see in the man, but so be it; that's your choice.
If you are not a Trump supporter, though, then ask yourself this question: How bad would it be if Trump became President? If, like me, you believe the answer is, mighty bad, then you have only one rational course of action: Vote for Hillary Clinton.
I know a lot of people who find that thought unpleasant. I know others who adore Clinton. Regardless, though, if you want to stop Trump, you must vote for Clinton. I have nothing against Gary Johnson, but giving him a vote in no way helps stop Trump. To stop Trump, again, you must vote for Clinton.
I could go on and on about why I think Clinton is the better candidate, but for the purposes of this discussion, none of that matters. What matters is that voting for her is the single best thing we can do to stop Trump.
Stop Trump. Vote for Clinton.
It really is that simple.