The Republican National Committee has a list of vote fraud cases listed by state. Most appear to be from 2006 through today and there are many involving local politics. Where there is smoke, there is generally fire. If vote fraud is being committed locally, you can bet it is happening to a far greater scale on state and national elections, IMHO.
http://www.gop.com/votefraud.htm
There are many more cases of national interest listed here on this thread.
L.A. County ballot flaw could void hundreds of thousands of votes(Florida In L.A.!!)
LA Daily News ^ | 1-6-08 | Troy Anderson
More than 750,000 nonpartisan voters live in Los Angeles County. If a chunk of these voters were disenfranchised, Alexander said, it could alter the statewide presidential primary results.
http://www.freerepublic.com/focus/f-news/1965930/posts
Massive Republican Voter Suppression in Southern Calilfornia!
News Talk Radio | 02-06-08 | PsyOp
Several people have called in saying they witnessed this happening at polling place they worked at as volunteers. One gentleman stated that he believed at least 20% of the Republicans that showed up to vote were denied a Republican primary form because the roster showed them as “Non-Partisan”.
The Republican Party in California has begun investigating this issue, but the mainstream media continues to report that Californias election “went smoothly”.
http://www.freerepublic.com/focus/f-news/1965899/posts