On March 28, 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.
Of those who answered the question, 48.0% revealed that they are going to vote for the Democrats, whereas 40.0% declared that they would give their vote to the Republicans. This poll was conducted from January 2 to January 7, among a random sample of 1470 registered voters. Estimated have a +/-2.6 percentage points error margin.
Other survey prognoses
Converting these results into two-party vote shares yields figures of 54.6% for the Democrats and 45.5% for the Republicans. In comparison to the average results of other polls in Iowa the Democrats did worse in this poll.