(Credit: Reuters/Brian Snyder/Shutterstock/Salon) Democrats appear headed for their biggest presidential election in years. Nate Silver has Democratic presidential nominee Hillary Clinton as an 86 percent favorite to move back to the White House. Some polls have given her leads in reliably red states like Arizona and Georgia. Iowa and Nevada are slipping away from Republican nominee Donald Trump; Texas is tightening; Virginia is gone. Polling averages by Silver and RealClearPolitics suggest that the Republican nominee’s fight is fading in the key battleground states of Ohio, Michigan, Wisconsin, Pennsylvania and North Carolina. It takes quite a Democratic wave to tilt this many states even powder blue.