Voter ID isn't the top issue for all Republicans. No, some like Rep. Leo Berman are still clinging on to last cycle's "big issue" of illegal immigration ad how it is destroying the state of Texas. It's such a burning single-issue that he's made it the highlight of his discussion of announcing an early July launch of a gubernatorial campaign to challenge Perry and Hutchison in the primary.
A likely side-effect of a Bermen run is that he will eat away votes from Perry's conservative/crazy base though I'm sure there are enough xenophobes and secessionists to go around for the both of them.