Obama is no longer President however if you are going to bring that up.  In an interview with George Stephanopoulis in September 2008 :

SEN. OBAMA: "And what was the first thing the McCain campaign went out and did? They said, look, these liberal blogs that support Obama are out there attacking Governor Palin. Let’s not play games. What I was suggesting — you’re absolutely right that John McCain has not talked about my Muslim faith …"