Four states are rapidly growing in population, according to the Census Bureau, and all four, while “Red” states in the 2012 Presidential election, have the potential to turn “Blue” either in 2016 or certainly by 2020.
North Carolina seems most likely to go for Hillary Clinton, followed by Georgia and possibly Arizona. Longer term, there is Texas.
With North Carolina having 15, Georgia having 16, Arizona having 11, and Texas having 38 electoral votes now, it is certain that all four will have MORE electoral votes starting in 2024.
And Florida, a “swing” state with constantly growing population, particularly of increased Puerto Rican migration, has 29 electoral votes through the 2020 Presidential election, and assuredly will have more in 2024.
So it is highly likely that the Democratic Party will have, for sure, over 400 electoral votes by 2020, and if not, by 2024, an Electoral College landslide for the long term!
Add the present 80 electoral votes of the four presently “Red” states to the 332 that Barack Obama had in 2012, and you get 412 electoral votes, and again, more by 2024 after the reapportionment of seats in the House of Representatives and in the Electoral College after the Census of 2020!
Add the Midwestern states of Indiana (11) and Missouri (10) and you get 433 electoral votes to 105 for the Republicans, but again with probably more total electoral votes by gaining of population in the four Sunbelt states, even with the chance that Indiana and Missouri will not gain, and might lose a seat each.
So expect the chance that the total number of electoral votes could, and with the addition of Florida and California gaining seats as well, be in the high 430s!