While I think it's funny that the tough on crime crowd is rallying behind a convicted felon it's important to remember that sometimes there ARE people who have been politically suppressed. Eugene Debs ran in 1920 for the socialist party. He'd been convicted for speaking out against WW1 at the time. He didn't win, but he did run.
What I hope is that Trump just doesn't win. His support goes way beyond simple constitutional rights or freedom of speech. These GOP voters are not REALLY saying convicted felons should be allowed to become president. They are saying TRUMP should be allowed to become president. It's populist, slightly cultish, and entirely frightening. Due process means nothing, personality and whatever they personally view as "strength" are what matters to them.