The New York Times reports that New York City Mayor Michael Bloomberg, an independent who has not endorsed either presidential candidate, is forming his own super PAC to spend millions on candidates in both parties who back his top causes -- same-sex marriage, tougher gun laws and education reform. 

Among those Mr. Bloomberg will support are Angus King, an independent running for the United States Senate in Maine; Gloria Negrete McLeod, who is challenging fellow a Democrat, Representative Joe Baca of California, whom the mayor believes has been weak on gun-control; and Representative Bob Dold, a Republican from Illinois who has backed gun-control measures.

There's already a super PAC devoted to supporting independent candidates in California, and an anti-incumbent super PAC targeted members of both parties in primaries across the nation before running out of funds. But neither has had Bloomberg's spending power or national prominence.

The billionaire businessman was overheard at a party in June saying that he probably would not publicly back a presidential candidate. According to those who heard the conversation, Bloomberg said he thought Republican Mitt Romney would run the country better than President Obama but that could not endorse Romney's views on social issues.