That is completely ridiculous. Who would make such a dumb rule? They cant vote for who their president will be, but they can run for it?! That is like saying i can't pick who will be captain for flag football, but I can run for it. Just propostrous.
Heres a case file: http://en.wikipedia.org/wiki/Leonard_Peltier Leonard Peltier killed 2 FBI agents in 1975, and is not to be released til 2040, and in 2004 he ran for president. The land of the free, even when not so free