Where's Harkin?

Tom Harkin, my old boss in the early '70's (along with every other Democrat in Iowa, it seems), has fallen oddly silent. The last time I heard anything from him was on CSPAN coverage of the annual Harkin Steak Fry last Summer or Fall, where Barak Obama fired up the faithful. Harkin silent on the war in Iraq? Harkin silent on Bush? Harkin silent for any reason? Makes no sense, unless he's run off with an astronaut...