Obama has just released this all Spanish add, and the accent is not bad at all. He should have tried that a while ago:
Transcripts below the fold...
In Spanish (my own transcript):
Compartimos un sueño, que trabajando duro, tu familia puede triunfar. Que si te enfermas, tengas un seguro médico. Que nuestros hijos puedan recibir una buena educación, sean ricos o pobres. Este es el sueño americano. Te pido tu voto, no solo para mi y los demócratas si no para matener ese sueño vivo para ti y para tus hijos. Soy Barack Obama y yo apruebo este mensaje.
In English (my own translation):
We share a dream, that working hard, your family can succeed. That if you fall ill, you’ll have medical insurance. That our children will be able to receive a good education, if they are rich as if they are poor. This is the American dream. I ask your vote, not only for me and the democrats, but also to keep this dream alive for you and your children. I am Barack Obama and I approve this message.