[ cheers and applaucheers >> welcome to des moines iowa, the last of three special town halls this week, days before the first in the nation iowa caucuses. i'm bret baier and we are here in des moines. as we look outside it's cold it's brisk it's snowy but we are warm inside with a lot of questions from iowans. >> i'm martha maccallum. we are with iowa voters some decided some undecided. some have been here more than one night. they look forward to questioning the candidates. tonight it's the former president and the g.o.p. frontrunner and we know none of the campaigns have input what