The Dems are playing immigration-related radio commercials in Spanish. The speaker is former BP sector chief and Congressman Silvestre Reyes:

...Now, instead of acting to secure our borders and pass immigration reform; Republicans are holding hearings, just so they can keep scapegoating immigrants. They think that's how they'll win elections in November...

Someone calling himself "biff" has posted the following comment on the thread about this at the DNC's site, and I find "biff"'s thoughts particularly insightful:

Nora: the "ad guy" you're talking about is our Chairman, Howard Dean. He's the one who determined that the GOP is scapegoating immigrants. And, a powerful charge it is.

I would go a bit further however, and I encourage the DNC to be as welcoming to immigrants as possible. We already support what amounts to an open border, why not make that official policy? Wouldn't that be the best way to get the Hispanic vote?

The DNC should just come right out and say that our party supports a completely open border. Voters appreciate honesty!

Democratic leaders: listen to "biff"! He's got your best interests at heart!