With the findings from the posse being what they are, couldn’t they be used to keep him off the ballot in Arizona? Since no state legislatures seem to have the stones to do it. It would, hopefully, force him or his legion to defend these matters in an open forum. Maybe.
At this point it seems that our best chance is to vote him out but that won’t be easy with his 1B smear machine and all the cheating that will surely happen.
Other than that...feeding the voters with as much info as possible - a la Sheriff Joe and articles like this one - will hopefully seed the national outrage. The communists are very good at playing this game however - i.e. the term “birther” and there are plenty of people who want to vote for Obama because he sang the words “let’s stay together”.
Could Hitler succeed here today? I’m afraid the answer isn’t automatically “NO”.