BY JOHN LAIRD THE COLUMBIAN EDITORIAL PAGE EDITOR Tea party patrons, rejoice! Unite! Or for some of you, I suppose, to arms! Your grass-roots movement has gained such momentum as to warrant a national blue-ribbon, round-table, fact-finding, rootin' tootin' hoedown! The first National Tea Party Convention is set for Feb. 4-6 at Nashville's Gaylord Opryland Hotel & Convention Center. For details, visit the Web site www.nationalteapartyconvention.com. Hurry, and get an early discount on registration: $558.95 (excluding hotel) to show up and protest excessive spending by the government. Headline speakers will include the electrifying and eloquent Sarah Palin, a renowned expert...