The veto with specific reasons commits her to working for an improved bill, yes?
Is there still time to pass a bill for the 2012 elections?
The veto might also serve to give Brewer cover that could be cited by Brewer in the future to demonstrate that she is not just a Tea Party / Birther “tool.” This would be useful to Brewer if she wanted to be re-elected or to run for president someday (just saying)...