Fewer than 500,000 votes total from four states, Florida, Virginia, Ohio and New Hampshire, kept Romney from victory in 2012.
From the story here:
. . . Trump might need a smaller surge of 3 million white men to show up at the polls.
That’s not out of the question, considering that the white vote decreased by 2 million voters between 2008 and 2012 — a drop analysts attributed to Romney’s lack of appeal with the working class.
Republicans say the drop-off in white working class voters was the worst in deep red states that Romney won easily, but it also affected the tally in Ohio, a pivotal battleground.