Duncan Hunter is a man I would support for President. He's miles ahead of anyone else mentioned, and he has no dirty laundry behind him. He has represented California in a way few others have.
Americans are begging for strong immigration law enforcement, and the other GOP candidates offer nothing on that disastrous issue.
For those who aren't familiar with him: http://www.house.gov/hunter/
He is one of the few members of congress who has a child in the military.