The Hill’s Briefing Room brings the news that the Nationals have extended an invitation to President Barack Obama to toss out the first pitch during the Nats’ 2009 home opener on April 13 against Philadelphia. It doesn’t come as a surprise — Obama, a dutiful Chicago White Sox fan, made it no secret on the campaign trail and in his short time in office that he’s a big time sports fan. (Obama is also considering an invitation to kick off the Southside club’s season on April 6.) It’s probably safe to assume that Obama, if he decides to throw the pitch, would receive a warmer welcome at Nationals Park than former President George W. Bush did last year when he helped usher in the new season and stadium.