. . . The 'long form' will not satisfy birthers, as the 'short form' already proves the location of Obama's birth . . .
No. At that time the short form "Certificate of Live Birth" was available and issued to babies born elsewhere. The "long form" is very specific about the place of actual birth.
Most likely it exists, is valid . . . and as already discussed, shows something that would be embarassing to Obama; maybe it lists race as "White" or maybe it lists religion as "Moslem." In the first case, people would claim he's not America's ". . . first Black president." (HA!) In the second case, in the eyes of a couple of hundred million Moslems, it would show him as an apostate, which is regarded as a Bad Thing. (Fatwa time . . . )
IMO, the Republicans would be stupid to officially touch this issue.
The smartest way to touch this issue - without abandoning it entirely - would be at the state level - where some states could pass a law requiring submission of a certified copy of the birth certificate by
any candidate running for an office that requires "natural born" citizenship.