WASHINGTON (AP) - September 21, 2009 --President Barack Obama starts the week in New York, where he'll continue his health-care media blitz with another TV appearance. He'll tape an interview on the "Late Show" with David Letterman. CBS says this will be the show's first visit by a sitting president. Obama has appeared on the Letterman show five times, but this time he's the only guest. But first, the president travels to upstate Troy, N.Y. There, he'll tour a technology classroom at Hudson Valley Community College with Vice President Joe Biden's wife, Dr. Jill Biden. Obama will speak on the economy.