It may be dead in Hawaii, but I think AZ passed a law saying he has to show his BC to be on their ballot next go round. If a few others did the same, he would be numerically unable to win. He has to file to be on the ballot just like the first time so even if one state held it up, it would be telling to see if he produced one.( not the Cert of Live Birth either)
The last I heard that law got tabled in the AZ senate due to them already having enough controversy with the passage of immigration law SB1070. I do hope they take up the issue again because it's important to get these laws in place in as many states as possible in time for the the 2012 election.