He will run as a Republican.
If he wins the primary, its off to the general.
If he loses, and has already been placed on the ballot by Libertarians, Constitution Party, Nader, the Greens, he may use this as an avenue to get into the general election debates. If that happens, expect him to either be president or retire from congress all together and hit the lecture circuit.
I think that about sums it up.
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