Sarah Palin at the Iowa State Fair

Republican Sarah Palin rolled into Iowa's state fair on Friday, stealing the spotlight from the party's presidential contenders and sparking a new round of speculation about her plans for 2012.

Palin's visit to the cattle barn at the fair attracted a crush of photographers, reporters, fans and onlookers who swarmed the former Alaska governor, alarming the cows and bringing activity in the barn to a temporary halt.

The timing of the visit, a day before a straw poll that is a big early test of campaign strength for the 2012 Republican presidential contenders, renewed questions about whether she will jump in the race.

Palin, who stopped to talk to reporters and fans outside the barn, said she was still uncertain of her decision but there was time and room for more candidates to join the race.

"I think there is plenty of time to jump in the race," she said. "Watching the whole process over the last year certainly shows me that, yes, there is plenty of room for more people."

She said that "practically speaking" September would probably be a deadline for her decision. "I don't want to be perceived as stringing people along," she said.

Palin joined a half-dozen declared Republican presidential candidates who visited the fair on Friday to speak at a local newspaper's stage, make a traditional visit to a life-size sculpted butter cow and eat fried Oreo cookies or meats on a stick.

The timing of Palin's visit raised eyebrows among political observers, who have been playing a will-she-or-won't-she-run game for months. It's not the first time the former Alaska governor has stolen the spotlight in politically important moments – earlier this summer she made an appearance in New Hampshire on the same day Mitt Romney officially declared his candidacy there.

Bachmann leads polls in Iowa and is an early favorite in Saturday's straw poll, a nonbinding mock election that tests the strength of campaigns and traditionally winnows out some losers from the field.

Republican front-runner Mitt Romney is not participating in the poll but will be on the ballot. Bachmann is being challenged by Pawlenty, who has campaigned hard in Iowa and needs a good showing to prove his viability.

Palin said Thursday night's debate involving eight of the declared Republican candidates in Iowa was "great." She welcomed the entry of Perry into the race but said it would have no bearing on her final decision.

"It adds to the debate, it adds another voice for Americans to consider," she said.

During her visit Palin ignored a shouted question from Alaska resident Tamara Roselius of Fairbanks, who asked why she gave up on the state. Palin resigned as Alaska governor with 18 months left in her first term, in part to escape ethics probes that had drained the family finances.

Palin's husband Todd approached Roselius and asked "when you have all that hanging over your head ... what would you do? Bankrupt your family.