Pretty sure McCain and Dukakis ran worse campaigns.
Sure, his climb from 20% to 30% is significant ~ he got a 50% increase over the last 5 years, but 30% doesn't put boots on the ground when it comes to running a campaign against the entire Democrat party.
I don't think Romney is electable.
I would say the Dole campaign was the worst, though it is hard to rate the worst.