Has anyone noticed something odd about recent New York Yankees World Series championships?

http://www.cbc.ca/sports/baseball/story/2009/11/04/sp-yankees-phillies-gamesix.html

http://en.wikipedia.org/wiki/Championships_of_the_New_York_Yankees

Since 1961, the Yankees have only won a World Series Championship when a Democrat was President.

World Series Champions
New York Yankees
1961 and 1962 (Kennedy)

World Series Champions
New York Yankees
1977 and 1978 (Carter)

World Series Champions
New York Yankees
1996, 1998, 1999, 2000 (Clinton)

World Series Champions
New York Yankees
2009 (Obama)

They never have won a championship when Nixon, Ford, Reagan, Bush and W were occupying the White House.

I wonder what that means?