From the Gallup Poll:
The Republican Party in 2011 looks similar, demographically and ideologically, to the Republican Party that nominated John McCain in 2008. As a group, Republicans continue to be more likely than average to be male, white, married, and religious, and to describe their political views as "conservative."
Commentary from the National Journal:
An analysis of tens of thousands of nightly Gallup tracking-poll interviews shows that the Republican primary electorate that will choose the party’s 2012 presidential nominee may look very much like the GOP’s voter base in 2008—with some potentially important changes at the margin. In this cycle, the Gallup trends suggest, the primaries could see an increase in both the youngest and oldest participants and a rise in the share of conservative voters.
