phones. Gallup Poll January 14-16, 2011: Telephone interviews were conducted with a random sample of 1,032 adults, aged 18+, living in the continental U.S., selected using random-digit dial sampling. May 5-8, 2011: Telephone interviews were conducted with a random sample of 1,018 adults, aged 18 and older, living in the continental U.S., selected using random-digit-dial sampling.