Source:
Gallup PollAn average of 36% of Americans identified as Democrats last yearPRINCETON, NJ -- An average of 36% of Americans identified themselves as Democrats and 28% as Republicans in 2008. That eight-point advantage is the largest for the Democratic Party since Gallup began regularly conducting its polls by telephone in 1988.
Those data are based on the average party identification in Gallup's 2008 stand-alone polls, consisting of more than 30,000 interviews.
The year-by-year trend shows that Democrats have gained ground against Republicans in each of the last five years, going from a deficit of two points in 2003 to the most recent eight-point advantage.
Additionally, the 36% of Americans who identified as Democrats last year matches the high point in Democratic identification since 1988, when it was also 36%. But since fewer Americans identified as Republicans last year (28%) than in 1988 (31%), the Democratic advantage was larger in 2008.
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http://www.gallup.com/poll/113947/Democrats-2008-Advantage-Party-Largest.aspx