[wildandcrazyrussian]

Actually, the GOP vote has been increasing for 20 years:

1996   Dole     37,816,307
2000   Bush     50,459,211
2004   Bush     59,130,092
2008   McCain   59,948,323
2012   Romney   60,265,579

[Vaquero]

Did you factor in population increases in that time period