Personal failings are not a disgrace to a public office. We don't elect officials because they're faithful to their spouses; we elect them because we trust them to do the job the way we want them to do it. I would not want Arnold to be president for the simple reason that he's right-wing and I'm not.
thirdly reagan wasn't horrible. he cut taxes and made movements in american politics that would never have come otherwise. IE welfare reform. he also stood up to communism. Such actions like help the afganis kick out the russians and the action in grenada.
Welfare reform? Yeah, if you mean making it so poor people can't get welfare, sure.
Stood up to communism? Eh, okay. That's not a major accomplishment in a country that's populated by people who equate communism with the Second Coming. And he stood up to communism by spending too much on the military after he had cut the taxes that would have funded it, as well as investing in bogus military techonology, i.e. Star Wars.