Washington -- Hundreds of suit-and-tie-clad marijuana advocates feasted on chicken Kiev and Petite Sirah on Capitol Hill on Wednesday night in what may have been the most button-down gathering of pot enthusiasts in history. The music was contemporary jazz, not reggae. The dessert was a caramel parfait with chocolate drizzle, not Oreos. And the featured Cheech and Chong video was a snippet of a documentary on actor Tommy Chong's recent imprisonment. The event, a strictly nonsmoking affair that drew members of Congress, a prominent television talk show host, and seasoned Washington operatives, was a mainstream coming-out of sorts for the...