The PredictIt-prediction market's current forecast is a two-party vote share of 58.4% for Clinton and 41.6% for Trump in Iowa. For comparison: Only 57.6% was gained by Clinton on June 3, for Trump this number was 42.4%.
Iowa is traditionally a purple state, where the two major political parties have often won similar levels of support among voters. Hence, the election outcome here is viewed as crucial in determining who will win the majority of electoral votes.
The prediction market results for Clinton are thus 4.4 percentage points above the combined PollyVote, which at the moment predicts a value of 54.0% in Iowa.