Actor Justin Long from the famous “Mac vs PC” ads joins Team Obama in a new ad encouraging young people to start mobilizing the vote for the President.

“I want to let you in on a little secret,” he warns. “The other side doesn’t think we can’t do it. The other side thinks that you, the young people of America are going to sit on the sidelines.”

Long encourages all young people start registering their friends and canvassing their neighborhoods in support for Obama.

“If you’re not registered, you can’t vote,” he warns. “And if you can’t vote, your voice can’t be heard.”