Mississippi Senator Trent Lott's new memoir, Herding Cats: A Life in Politics, goes on sale this week, more than 2-1/2 years after he was ousted as the Senate's Republican leader. That experience, it would seem, has taught him nothing. As Lott tells the tale, he lost his post because disloyal Senate colleagues exploited an ''innocent but thoughtless remark" he made about Strom Thurmond's segregationist presidential campaign of 1948. He fumes in particular over Senator Bill Frist of Tennessee, who succeeded him as Republican leader. ''I considered Frist's power grab a personal betrayal," Lott writes in the new book, according to...