The legacy media wants a liberal President. If they can't get a liberal Dem, they'll take a liberal Pub. It's that simple.
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Plus, they know they can depress the Republican vote by playing up Rudy’s liberalism once he’s got the nomination.
To be honest with you, I never looked at it that way. It is axiomatic that the left wanted to boost Rudy, so they could trash him, as he has more baggage than Paris Hilton. But It never crossed my mind that Rudy is so liberal, that if the MSM could not destroy him, they could tolerate him as the winner. OK, I never claimed to be a brain surgeon : )