The Pew Research Center also reports on trends over time in a study released last year. And click here for a great interactive graphic of ID from 1939-1012. The biggest story over the past 20 years has been the increase in self described independents, but as we will see, calling your self independent does not mean that one does not consistently vote for one of the major parties over the other. These people are called leaners.
Here are some of their graphics. This looks at ID overall:
And another that breaks down ID by race:
by gender:
by religion:
and by age:
