On March 27, 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 Democratic party, whereas 40.0% said they would vote for the Republicans. This poll was conducted from January 2 to January 7, among a random sample of 1470 registered voters. Results have a +/-2.6 percentage points error margin.
In comparison with other surveys
Translating these results into two-party vote shares yields values of 54.6% for the Democrat Hillary Clinton and 45.5% for the Republican Donald Trump. In comparison to the average results of other polls in Iowa the Democrats did worse in this poll.