by a landslide

By a very large and decisive margin, as of a victory. Her candidacy was a long shot from the very beginning, so when she won by a landslide, it was a huge surprise to everyone. Everyone thought it would be a close game, but with a 45-point lead heading into the last two minutes, it looks like the underdogs are going to win it by a landslide. I figured that candidate would win, but I didn't expect it to be by a landslide!