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Former U.S. Vice presidential candidate and Alaska Governor Sarah Palin prepares to participate in 'Rolling Thunder' motorcycle parade May 29, 2011 in Arlington, Virginia.
Sarah Palin is on day three of a bus trip she insists is not a campaign tour. And Mitt Romney is set to announce he's in the running later this week. Today he had harsh words for President Obama in an interview broadcast on NBC. NPR political editor Ken Rudin joins us to talk about the Republican presidential hopefuls.