With just one day left before the polls open, Democrats have settled on a closing message to the 2012 campaign that portrays the Obama presidency as a brief moment of enlightenment in America’s bleak past and future. America used to be a place of economic, racial, and sexual oppression--and it would be again, Democrats argue, if the country turned to Romney instead of rewarding Obama with a second term in office. That is what Obama means when he invokes the repeated refrain--“We’ve come too far to turn back now.”