I had trouble and was unable to vote in the 2000 elections under suspicious circumstances. Before the elections I hadn't received my voting information that is typically sent out. On calling the county registrar's office the clerk-who sounded like she could be suborned on the cheap with crack cocaine-told me my "signature was invalid". This was odd as I voted for Dole in 96 on the same "invalid signature". Finally, I negotiated to be able to cast a provisional ballet which would be valid weeks after-the-fact. This is Los Angeles County.
I was going to leave work to vote, but the election had already been called for Gore which indicated to me voting would be futile.
In Texas they keep toying around with the idea of having to have a photo ID and a voter's registration card to vote. Fine, well and good, but they didn't send me a voter's regis. card one year when we had an election! Easy way to keep Republicans from voting.