The pollster behind the bombshell survey that sent shockwaves through the presidential election on Saturday night has defended the results showing leading in the conservative state.
Ann Selzer has built a reputation as 'Iowa's Polling Queen' and the 'best pollster in politics' over decades of conducting the Des Moines Register polls.
But the creditability of 'the polling Cassandra of Des Moines' was brought into question over findings that the vice president was ahead of Trump in the heavily-Republican Hawkeye State.
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