From Gallup Polls:

GOP Identification in 2007 Lowest in Last Two Decades

The percentage of Americans who identified as Republicans in 2007 is the lowest of any of the 20 calendar years since 1988 that Gallup has conducted its interviewing primarily by telephone. An average of 27.7% of Americans identified as Republicans, based on more than 26,000 Gallup interviews in 2007. The previous low in Republican identification was 28.1% in 1999….