The share of voters who are undecided or uncommitted to any of the four candidates named has fallen by five points since July, to 11%. But most of the support has moved to Libertarian Party candidate Gary Johnson, who now garners 7%. That’s a notable increase for a third-party challenger, and suggests continued discontent with the major party’s nominees in a state Barack Obama won twice, but which went Republican in 2004. Both Clinton and Trump also struggle with voters from their own parties. Only 80% of Iowa Democrats back Clinton, and 76% of Republicans back Trump…

Ninety percent of Democrats back Clinton in the all-important swing state, while just 79% of Republicans back Trump. However, most of the shift towards Clinton comes from independents. Independents still break for Trump by a six-point margin (42-36), but that’s down from a 19-point margin (46-27) in July. The former Secretary of State also benefits from overwhelming support among the state’s African-American voters, topping her Republican opponent 91-3, a slight improvement from the 85-6 split in the previous month.