How can you be conservative and justify wiretapping people without a warrant? We're supposed to be the party of personal freedom and civil liberties.
You can't wake up one day and say 'I'm for gay marriage,' and wake up the next day and say 'I'm against it.' Wake up one day and say, 'I'm pro-choice,' and the next day wake up and say, 'I'm pro-life.' There's no credibility there.