March 25, 2003 Channels of InfluenceBy PAUL KRUGMAN y and large, recent pro-war rallies haven't drawn nearly as many people as antiwar rallies, but they have certainly been vehement. One of the most striking took place after Natalie Maines, lead singer for the Dixie Chicks, criticized President Bush: a crowd gathered in Louisiana to watch a 33,000-pound tractor smash a collection of Dixie Chicks CD's, tapes and other paraphernalia. To those familiar with 20th-century European history it seemed eerily reminiscent of. . . . But as Sinclair Lewis said, it can't happen here. Who has been organizing those pro-war...