According to the current results of the prediction market PredictIt the two-party vote share for Clinton in Iowa is 58.6%, while Trump obtained 41.4%. For comparison: 59.0% was gained by Clinton on June 4, for Trump this number was only 41.0%.
Iowa is traditionally a purple state, where the GOP and the Democrats have historically achieved similar levels of voter support. This is why the election outcome here is regarded important in determining which party will win the majority of electoral votes.
In Comparison, the PollyVote currently predicts Clinton to gain 54.1% of the two-party vote in Iowa, which is 4.5 percentage points below the prediction market results.