The former vice presidential nominee also welcomed Texas Gov. Rick Perry, who is set to officially announce his candidacy Saturday in South Carolina, into the race.
"I appreciate that Perry sounds like now he's going to be in the race because that adds to the debate," she said. "I appreciate that he's willing to jump into the arena."
Palin spent about 90 minutes touring the fairgrounds, posing for pictures and talking with reporters before leaving. Some in attendance with her were still stunned to see the conservative icon.
Melissa Doll, a 46-year old teacher from Lynnville, was excited to have snapped a picture on her cellphone.
"We've been at the hog show. Who knew?" she said. "You never know who you're going to see at the Iowa state fair."