Jason Zengerle seems to have the goods:
Obama meet with Ludacris (maybe they compared Grammys); and Hillary Clinton tap Timbaland (not a rapper, per se, but a producer of many rappers) to host a big fundraiser. And don’t forget John Edwards doing yoga with hip-hop mogul Russell Simmons last summer. That’s three examples. It’s a bona fide trend!
Well; I find that surprising, but it all checks out.