Now lets be even more generous to Trump. Lets assume he can win college educated white voters by larger margins than Romney did (which seems unlikely, though not impossible), and calculate how much he would need to improve over Romneys performance among white voters overall, meaning among both working class and college educated whites taken as one group. (This again assumes the Dem wins among nonwhites by the same margins Obama did.) If you factor in demographic shifts, heres what you get:
In Michigan, where Romney beat Obama by 52-46 among white voters overall, Trump would have to win among them by 58-40, an improvement of 12 points.
In Wisconsin, where Romney beat Obama by 50-49 among white voters overall, Trump would have to win among them by 54-45, an improvement over Romney of eight points.
In Pennsylvania, where Romney beat Obama 54-44 among white voters overall, Trump would have to win among them by 58-40, an improvement of eight points.
In Ohio, where Romney beat Obama by 56-42 among white voters overall, Trump would have to win among them by 58-40, an improvement of four points. (This seems doable, but again, this presumes Trump makes inroads among college educated whites and that the nonwhite spread remains the same.)