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“The major difference between former Secretary of State Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support MORE and Vice President Joseph Biden is that she runs much better among independent voters, although Sen. Rand PaulRandal (Rand) Howard PaulHouse bill set to reignite debate on warrantless surveillance Authorizing military force is necessary, but insufficient GOP feuds with outside group over analysis of tax framework MORE runs better among that key group than either Democrat,” said Peter A. Brown, assistant director of the Quinnipiac University Polling Institute, in a statement.

"In general Sen. Paul appears to be the better GOP candidate at this point in Iowa. Part of the reason may be the publicity from his recent high-profile visit to the state, but more likely is that he begins with a solid base of support – the folks who voted for his father in the 2008 and 2012 caucuses.”

Iowa is a crucial battleground for presidential candidates, both as an early voting primary state that can decide the fate of a nascent campaign and a crucial battleground that can swing a general election.

The poll also found that Iowa voters aren't particularly familiar with the candidates who will seek to succeed Sen. Tom HarkinTom HarkinThe Hill's 12:30 Report Distance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds MORE (D-Iowa) in next year's election. Harkin announced earlier this year his intention to retire.

Rep. Bruce BraleyBruce BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE (D-Iowa), the likely Democratic nominee, is the best known in the field, viewed favorably by 27 percent and unfavorably by 14 percent. By contrast, the percentage of voters reporting that they don't recognize Republican hopefuls, including Matt Whitaker, Joni Ernst, Matt Schultz, David Young and A.J. Spiker, ranges from 81 to 94 percent

“Iowans can look forward to a lot of television ads as all these candidates try to introduce themselves to the folks who have no idea who they are,” said Brown. “Braley is clearly better known than the Republicans, but he too is an unknown to a majority of Iowa voters.”