The last I heard, a voter reg card IS NO LONGER accepted. As long as the names match up, you should not have any trouble with a birth cert and a drivers license. Just make sure the birth certificate has a raised seal, a photo copy without the raised seal will not be acceptable. Like others have said, a PP is the way to go, if for no other reason than you get the neat stamps on it. You can get the forms for the PP off the web BUT be sure to take BOTH pages. As stupid as it sounds, the second page is just instructions but if you do not have it with you, they will not accept the application. You will also need a birth certificate for the PP as well so if you have to get one, get 2. You have to send it with the application, they return it with the PP.
Just saw your last post
Don't know where you are from but here in NC, you can get one in a few minutes at the court house in the county where you were born. If you don't live close by, at least here in NC, you parents can also get one for you.