Saying this is about politics is a deflection. I could as easily say laws against denying blacks the right to vote are about politics.
In both cases the law addresses a wrong. Vote fraud is wrong, not a right. Every fraudulent vote offsets a legitimate vote. It's not a victimless crime.
Rights carry responsibilities. If exercising your right to vote is so unimportant to you that you don't get a proper ID, don't register, etc, you have no business voting. You certainly shouldn't be able to hand your vote off like a corporate proxy to some activist group.
For all their whining about "democracy," liberals have no taste for it when they can't control the outcome. Look at the big fight over so-called Cardcheck, a proposed law that would do away with secret union certification elections. Instead, union goons could come to your home or catch you at the parking lot and demand that you sign a card making them your rep and thus handing them part of your paycheck. Tony Soprano would have loved it.