Rock The Vote

I finally got around to registering to vote. Well, I got the form at least, I just need to photocopy my license and send it in.

I was amused by one of the Frequently Asked Questions on the website:
Q. Are bars closed in my State on election day?

The answer is given as a big chart that shows polling place times, etc., by state. Turns out bars are closed in Deleware, Pennsylvania, Utah, South Carolina, Indiana, and Kentucky.
Who's responsible for these regulations, and are they really fearful that people will get drunk and waste their vote/forget to vote/vote for the "wrong" person/get violent when their candidate loses?