Why does the GOP employ dirty tactics in hopes of winning the presidential election?

You've got to be kidding. The Democrats register dead people. Their pet radical organization, which Obama paid $800,000 to for a get-out-the-vote campaign, has been convicted of voter fraud numerous times. They're currently dragging homeless people to the polls for early votes in Ohio. There are teachers unions in government-funded schools influencing eligible teenagers. You've got no moral authority here blaming Republicans. The Dems are the experts at voter fraud.