Kristen Schmid for The New York Times Frank Weltner is the author of Jewwatch.com and Webcaster for white separatist news and commentary. ST. LOUIS, April 5 - Frank Weltner's cluttered living room is one of the unlikely new hot spots in America's old and ongoing preoccupation with race. Mr. Weltner, a 63-year-old former local radio talk show host, began what white power groups say is the first round-the-clock racial Webcast this year. He can run many Web sites, including what he calls his most popular one, Jewwatch.com, with a laptop computer and a microphone from the comfort of his couch....