Its demographics. The largest percentage of voters was, is and will be the Grey-Haired Brigade- the senior citizens. Period. It just so happens that the baby boomers represent the largest number of senior citizens yet to come. From 1945 to about 1965, 77 million people were born in the USA. Starting in 2010, 65 years after 1945, the boomers are retiring or are set to retire. That is about 4 million people per year on average. As people get older, they focus more on politics and get more involved; at a minimum, they vote. Grab your ankles folks, cause the boomers are going to DOMINATE the electorate.
Lube up jackass.