National ID card? Rethink the solution, please. Eliminate provisional ballots. In or out.
Provisional ballots are not the problem and, while cumbersome, have probably managed to weed out at least some fraud in this election.
Double voting, the voting of the dead, etc. is the real problem. Why not make a standard photo ID - driver's license or state ID card for non-drivers - a requirement for registration? Right now, some states don't even require any form of photo ID.
And then develop a national database of voters for federal election purposes, using the Social Security # of the voter as the main key, but other ID as well for illegal immigrants or others who might have phony SS#s. The infrastructure for this is already in place, and all it would require is a little standardization of state election laws (and I think some constitutional way has got to be found for standardizing election law for federal elections).