One reason people suspect that republicans use challenges to suppress legitimate voting is the lack of evidence of illegal voting by anyone fraudulently registered:
GOP offers scant proof of voter fraud
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For weeks, Republican leaders have warned that widely reported problems with fake voter registrations could result in a flood of phony votes in pivotal states.
But Ronald Michaelson, a veteran election administrator and member of the McCain-Palin Honest and Open Election Committee, said in an interview that he could not name a single instance in which this had occurred.
Thinking over my own experience as an election official in Michigan, the biggest hole I see is the possiblity that someone legitimately registered in one precinct could move and legitimately register in another while the first registration remains on the books. If dishonest, the voter could conceivably vote in both locations.
Because of the very low number of fraudulent votes that could be cast this way, it would be an extremely rare election that could be changed that way. And once the statewide database of registered voters is complete and accurate, of course, that possibility too will disappear.
Canvasing door-to-door for Obama this year using the state's database sequenced by address, I did find quite a few locations with several voters registered at the same address. Sometimes people had died and still remained on the rolls. But usually one or two voters had moved away some time ago, and the other names were voters who had then moved in.
The upshot is that the database really does need to be purged of no-longer-valid registrations. However, the purge must be done reasonably - not kicking off voters because of minor variations between corresponding database fields.
And it has to be done in such a way that voters have the opportunity to learn about and call attention to errors in the purging process. I can think of some ways this could be done, and I'm sure others can think of even more ways.
In my opinion, the courts have been correct to stop the wholesale purging of registrations just before the election. By all accounts, any fraud prevented by those purges would be miniscule at best. On the other hand, the suppression of valid votes would be considerable. And those officials attempting the purges knew that.
Let me say, though, that I have never personally witnessed a case where either a republican or a democrat has tried to suppress a valid vote. On the contrary, all of the election officials I've worked with - even those I disagree with on almost every political issue - have busted their butts to make sure that every valid vote is properly counted.
The growth of wisdom may be gauged exactly by the diminution of ill temper. — Friedrich Nietzsche
The infliction of cruelty with a good conscience is a delight to moralists — that is why they invented hell. — Bertrand Russell