Michele Bachmann has a narrow lead among Iowa Republicans heading into this weekend's Ames Straw Poll, according to Rasmussen Reports.
Bachmann came in with 22 percent of Iowans, barely ahead of Mitt Romney's 21 percent. Those numbers show little movement from an early July poll by the Iowa Republican, which had Bachmann ahead of Romney 25-21.
Tim Pawlenty, with 11 percent support, is running fifth in the same poll, trailing Ron Paul and Texas hair style Rick Perry, who still hasn't even declared his candidacy.
None of the numbers are solid, though. Almost 72 percent of those polled said they weren't sure who they'd support in the Ames Straw Poll, which will be held on Saturday and will be the first definitive result on the real Republican frontrunners.
The Rasmussen poll is a valuable insight into voters' mindset, but that unsure 72 percent could still be swayed by a Fox News-hosted debate on Thursday night.
Even Republicans who didn't pick Bachmann like her: She's got the highest approval rating in Iowa, 70 percent, of any candidate in the entire field, and 37 percent have a "Very Favorable" view of Bachmann. No other candidate came in above 20 percent in the "Very Favorable" category.
Pawlenty's actually third in the "Favorable" category, at 61 percent, just behind Romney's 62 percent rating.
Ron Paul's support is the least solidly Republican, with 51 percent of his potential voters saying they wouldn't vote for another Republican candidate, and 15 percent saying they'd rather vote for Barack Obama.
On the national level, Bachmann is trailing both Romney -- who polls at 22 percent among Republicans -- and Perry (18 percent) at 16 percent.
The Bachmann-Romney split is one pitting upstart Republicans against the establishment. About 34 of the Iowans polled described themselves as "Tea Party" Republicans, and a majority of them chose Bachmann. More mainstream, non-Tea Party Republicans are choosing Romney.