Talk about a political rock star.
 
A crowd estimated at more than 1,500 already had lined up by mid-morning at a Grand Rapids, Mich., bookstore in advance of a 6 p.m. book signing by 2008 Republican vice presidential candidate Sarah Palin, whose book "Going Rogue" has already become a runaway bestseller -- one day after its release.
 
Die-hard fans of the former Alaska governor traveled from all over the state and began setting up outside a Barnes & Noble store in the city's Woodland Mall at around 9 p.m. last night, hunkering down in 30-degree overnight temperatures to camp out nearly a day ahead of Mrs. Palin's arrival.