When Republican Rand Paul was elected to the Senate in November, he received a congratulatory call from an unexpected source: U.S. Sen. Al Franken. That 30-minute phone call -- the only one Paul received from a Democrat after Election Day -- has sparked an unlikely friendship between the Kentucky Tea Party conservative and an unapologetic Minnesota liberal. Franken attended Paul's party after he was sworn in as a senator, and Paul asked Franken to be his Democratic Senate mentor.