Bush did worse than Reagan, and that was after a near clean sweep by them in 1984.
That win in 84 was just a big enough cushion for 88, that Bush had room to play with.
Obama did far worse in 12 than 08, Hillary has no cushion for error.
The changing demography of the country fueled by mass immigration is changing the electoral map. If we don't reduce LEGAL IMMIGRATION drastically from the current 1.1 million a year, the Dems will become the permanent majority party within a decade. 87% of legal immigrants are minorities as defined by the USG. Immigrants and minorities vote more than two to one Dem. Demography is destiny.