"Step 4: Recruit group of persons who are willing to accept cash and keep their mouths shut to get driven around all day and be told who to vote for."
"Three people may keep a secret if two are dead" - Benny Franklin.
People talk. They love to talk and tell stories. They hate being told to shut up, even for money. It usually has to be a lot of money for them to shut up, especially when it comes to a federal crime and they are spotted. They will roll over on you and your scheme to stay out of jail.
$SUFFICIENTBRIBE == At least minimum wage for 24/7 behind bars for a year or two, plus extra for damage to reputation and future earning loss. And you have to /trust/ every last one of these people to keep their word.
Suddenly your "bus full of voter fraud" becomes very expensive, and you're better off just hiring more canvassers.
Voter fraud doesn't happen because it's too much work for the results and the penalty for being caught at it is too high for the risk. Electoral fraud, however, is fucking rampant. Various idiots like to conflate voter fraud with electoral fraud, most likely because "their side" is the side that does the electoral fraud and project on the other side voter fraud.
Why the public just goes along with electronic voting with no paper trail? I don't fucking know. It's not like this hasn't been talked about for the last 20 years, since the introduction of electronic voting machines.