I'm not so sure it's about the grades. It could be about the titles of the courses he took. Think of the reaction if his transcripts at Occidental and Columbia were loaded with courses like "African Studies 101" and "Economics 210: How to Create a Socialist Economy in America."
No, it's about whether he was listed as a foreign student or an American. It's about a social security number. I don't actually care what Obama took in college and I certainly don't care what his grades were.
I have his first four years in office to prove his incompetence. ;)