The Chicago Sun-Times:

SIOUX CITY, Iowa — Sarah Palin greeted hundreds of admirers in Iowa on Sunday, fueling speculation about a possible presidential run in 2012.
Iowa’s caucuses traditionally kick off the presidential nominating season, and Republican strategists saw the stop in Palin’s national book-signing tour as a signal not to be missed.
“No politician comes to Iowa by accident,” Republican strategist Tim Albrecht said. “Every politician knows the implications when they set foot here.”

Maybe she just wants to sell some (more) books?