I'm not quite sure how Hillary let this become such a problem for herself.
I never found her position on drivers' licenses for illegals all that inconsistent: Given the failure of the federal government to control the borders, you can't fault governors for taking matters into their own hands and trying to come up with reality-based programs to deal with illegal immigrants who are already here. Hillary wouldn't endorse licenses nationally, she'd pursue an immigration policy that let illegal drivers come out of the shadows, and gain legitimate documentation.
There's some nuance to the position, but it's not rocket science.
But instead of sticking up for states rights, or even just letting it lie, Clinton has now come out firmly in opposition to undocumented workers obtaining drivers' licenses. Just in time for the next debate.
So it's little surprise that her opponents were waiting to pounce. What's a bit surprising is that the first blow comes not from Edwards but Obama:
"When it takes two weeks and six different positions to answer one question on immigration, it's easier to understand why the Clinton campaign would rather plant their questions than answer them."