SAMPLING and TURNOUT – This poll was conducted by telephone calls to a random sample of Iowa homes with landline phone service. Adults identified as likely Republican caucus-goers account for 8 percent of respondents. That compares to GOP caucus turnout of 5 percent of the voting-age population in 1988 and 1996, and 4 percent in 2000.
METHODOLOGY – This ABC News/Washington Post poll was conducted by telephone Nov. 14-18, 2007, among a random sample of 400 Iowan adults likely to vote in the 2008 Republican presidential caucus. The results have a 5-point error margin. Sampling, data collection and tabulation by TNS of Horsham, Pa.