The thing that drove me, a lifelong conservative, into the arms of Bernie Sanders; the Republican party (and the conservative group in particular) are so hard core on social issues that are to be blunt, disgusting (things like preventing homosexual marriage and abortion) and completely antithetical to the idea of "keeping government out of things." No I don't like everything the Left wants to do, but I also have no love left for the Bible thumping I'm-ignorant-and-proud-of-it crowd.
I have too many homosexual friends who I know are good people. I have too many friends who had their contraception fail and aren't in any position to raise a child, recognize that, and want to wait to accept abortion. And more and more I'm realizing that the party of "leave us alone" wants the Government involved in way more things than the other one.
I don't know when this happened, I don't know why, but if you want the explanation there it is. You guys bank harder and harder on ignorance and fear every year until now you've got a candidate like Trump, with practically no ideas and nothing to offer except new things to fear.
I won't belong to the party of fear.