No link because you can only see this headline on AOL:
Rush Blitzes Black Athlete
Says Race Is Why QB Starts
Did Limbaugh Go Too Far?
This is what Limbaugh actually said on ESPN:
I think what we've had here is a little social concern in the NFL. The media has been very desirous that a black quarterback do well. They're interested in black coaches and black quarterbacks doing well ... McNabb got a lot of the credit for the performance of the team that he really didn't deserve.
One can disagree with he said, but he definitely did not say that McNabb is starting only because he's black. No one would know it, though, from just looking at the headline.