INDEPENDENCE, Mo., Nov. 23 - That legendary sign "The Buck Stops Here" gets prominent display at the Truman Presidential Museum and Library, along with a cautionary disclaimer that it is "unclear how long it sat" on Truman's Oval Office desk. But the sign, and its appearance here, provide a bracing contrast to the sensations inspired by the new William J. Clinton Presidential Center, 400 miles away in Little Rock, Ark. Some similarities might be expected. Both William Jefferson Clinton and Harry S. Truman were Democratic presidents sometimes facing hostile Republican-dominated Congresses; both were born without inheritance or distinguished lineage; both...