Using only states and territories that have completed their elections.
2008
Obama: 14,448,931
Clinton: 14,132,014
Other : 1,409,811
Total : 29,990,756
2016
Clinton : 13,368,151 (- 1,080,780)*
Sanders: 10,445,793 (- 3,686,221)*
Other : 439,979 (- 969,832)*
Total : 24,253,923 (- 5,736,833)*
* (vote difference between 2008 and 2016)