In the 2000 election I was a Poll Watcher in Houston, Texas. We needed at least 100 Poll Watchers to cover all of the suspicious precincts; there were only two of us.
Read my report which I posted as my Opus on Vote Fraud. In that election I prevented at least 100 fraudulent votes, mostly people who went from one polling place to the next voting multiple times. 100 fraudulent votes was about 12% of the votes cast that day at my assigned precinct. It does not count the fraudulent votes that slipped past me.
Based on my experience in several elections, at least 5% and possibly 10% of all votes cast in presidential elections are fraudulent. That means that Republicans must win by over 10% to beat the fraud.
Now, not only will the dims cover up the fraud, they will not FINANCE IT WITH YOUR TAX DOLLARS!
Conservatives are incredibly naive if they think fraud is not important.
I think tour estimates a probably very conservative concerning fraud :)