True Blue (18 states that voted Dem in all four Bush/Obama Elections): 241
Baby Blues (3 states that voted Dem 3 out of 4 times) 15
Purple States (5 states that voted for the winner 4 times: 75
Pink States (2* states that voted for the GOP 3 out of 4 times) 27
Deep Red (23 states that voted GOP in all 4 Bush/Obama elections: 179
Note: Nebraska's second district is counted with the pink states.
So there are 256 votes likely to vote for the Democrat and 206 likely to vote for the Republican in a close election. These 206 votes are the exact votes that Romney won in 2012.
But it's not all good news for Team Blue. In 2012 the Democrat won every close state except North Carolina. That is actually good news for the next Republican nominee. He or she will only have to really defend one state in a close election. Everywhere else they will be on offense. So the biggest question is what is the quickest path for them to get to 270. The simplest way to compute this is to flip the states they came closet to winning last time.
Here is every Baby Blue, Purple and Pink State,
So the Republican nominee can get to 235 by just adding Florida, 253 by also adding Ohio and 266 by flipping Florida, Ohio and Virginia. Beyond that they only need to pick up one more state. Colorado, New Hampshire alnd Iowa were all decided by less than six points and would be competitive if the Republicans run a better candidate and campaign than they did last time.