I think perhaps John McCain was wondering that same thing this morning as he accepted Mr. Yankee's endorsement. From the Wall Street Journal:

Daddy Yankee, the hip-hop star from Puerto Rico, endorsed the Republican candidate Monday morning. Wearing black aviator shades in the library of Central High School here, Daddy Yankee said, “I believe in his ideals and his proposals to lead this nation…He's been a fighter for the Hispanic community.”

The students gathered for the event clearly were not told ahead of time that Daddy Yankee was part of the deal. As the Latin-Grammy-winning recording artist walked into the room, the girls shrieked and screamed, grabbed each other by the hands and gasped at the sight of him. One girl fanned the tears from her eyes.

“I just wanna say thank you, Daddy Yankee,” McCain said.

Might be a minor matter, if the cable networks didn't cover it this morning (to some guffaws). Must be that whole "balanced coverage" ethos.