This is a map of where white voters were more liberal or more conservative than their national average in 2012:
Remarkably, this correctly predicts 47 states and DC. And in VA Romney and McCain got the same % of white voters despite the national swing, so the white vote there could easily be left of the nation next time around.
So what's going on in Montana? Florida makes a lot of sense though.
Montana has voted for D's mostly for US Senate in recent memory with Baucus, Tester, and Melcher except for Conrad Burns(R) who served in the US Senate from 1989-2006. Montana has voted R's for their At Large US House for the last 16 years. The state can be a bit swingy with having an R Governor in the 90's and first half of the 00's and than switching to a D Governor from 2005-present I believe.