Any donation from America’s top nanny to a Republican should automatically lead to banishment from the party.

Via Politico:

Former New York City Mayor Michael Bloomberg gave $250,000 to the super PAC supporting Sen. Lindsey Graham, (R-S.C.) in the primary battle he won by a wide margin last month, a source familiar with the donation told POLITICO.

The donation is set to be revealed in financial filings made public Tuesday by the West Main Street Values PAC, the source said.

The donation is the second Bloomberg has made in recent months to a Republican incumbent facing tea party unrest. Last month, filings showed that Bloomberg donated $250,000 to a super PAC supporting Sen. Thad Cochran (R-Miss.) in the rancorous primary with state Sen. Chris McDaniel.

The Graham super PAC was established by his allies, including former South Carolina State GOP chairman Katon Dawson.

Bloomberg’s goal in backing the GOP incumbents has been to support “candidates in primaries who have a track record of working across party lines,” said the source.