If he wins as a member of the CP, the CP stands against prohibition AFAIK. He would have no choice but to moderate on that issue. I don't recall Tancredo being a domestic drug warrior in any case, but I do recall him citing drug smuggling in his sealed border argument. I happen to agree that foreign drug smuggling is a legitimate problem -- it leads to lower quality and often tainted drugs to the point of becoming deadly toxic -- a problem that would be solved quickly by ending prohibition.
Beyond that I do not know much about Tancredo except I agree that foreign policy is pretty much irrelevant for a Governor.