Former Republican vice presidential candidate Sarah Palin is raising more speculation about a possible presidential bid with a stop in Iowa during her national book-signing tour.
Iowa's caucuses have traditionally launched the presidential nominating season.
Palin's book-signing tour has been carefully controlled, and she has not spoken to reporters at most events.
Still, her appearance in Iowa is seen as significant.
Veteran Republican activist Tim Albrecht says politicians don't just happen to stop in Iowa and Palin must know that her visit is seen as a signal she is considering a run.
Another possible Republican contender, Minnesota Gov. Tim Pawlenty, also visited the state recently.
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