On April 1, NBC/WSJ/MaristNBC/WSJ/Marist released the results of a new poll, in which respondents from Iowa were asked for whom they would vote if the parties' nominees were Hillary Clinton for the Democrats and Donald Trump for the Republicans.
The results show that 48.0% of respondents intend to vote for the Democrats, while 40.0% said they would vote for Republican party. The poll was in the field between January 2 and January 7. The sample size was 1470 registered voters. Estimated have a +/-2.6 percentage points sampling error. Converting these results into two-party vote shares yields values of 54.6% for the Democrats and 45.5% for the Republicans.