A new poll shows President Obama's popularity has taken a hit in Iowa. The Quinnipac University poll says voters disapprove of the job he's doing, 55 to 41-percent.
The results compares to a May disapproval rating of 50 to 45-percent.
Quinnipiac also asked voters who they'd vote for in several hypothetical 2016 presidential match-ups.
New Jersey Gov. Chris Christie tied with former Secretary of State Hillary Clinton 41 to 41-percent.
Clinton topped Wisconsin Gov. Scott Walker 46 to 39-percent.
Christie holds a strong lead over Vice President Joe Biden, 49 to 32-percent.
Walker tops Biden 42 to 39-percent.
Voters were also given the option of selecting a write-in candidate, or not voting.
“Christie’s favorability ratio [...] is impressive," says Peter Brown, assistant director of the Quinnipiac University Polling Institute.
"The question is whether he can sustain it as he becomes better known. If so, he could be a strong contender in 2016."
Quinnipiac University surveyed 1,256 registered voters via cellphone & landlines to gather these results. The margin of error is +/- 2.8 percent.