I think his father is. Our current president is right handed.
Try a search on some of their "first pitch" pics.
Guess you are correct
http://www.house.gov/apps/list/hearing/az01_renzi/p35579-20.jpg
As a matter of trivia, when Bush the father was running against Klintoon and Perot, all of them were left-handed.
Weird huh?
On a personal note, I pitch right-handed but write left-handed. Back to the story at hand, this is a pathetic non-story. Wow, the President is a human being with bodily functions. I thought there were more important things going on in the world right now.