Are the Dixie Chicks victims of a right-wing conspiracy? That's what their manager, Simon Renshaw, has told country music stations being pressured to drop the Chicks' music after lead singer Natalie Maines criticized President Bush last week. In an e-mail to stations distributed by Sony Music, their label, Renshaw says the protest has been orchestrated by the Free Republic (www.freerepublic.com) , a Web site "for independent, grassroots conservative, " according to founder Jim Robinson of Fresno, Calif. The Web site also alleges that recent anti-war protests are "communist-organized demonstrations." "Your company is being targeted by a radical right-wing online forum,"...