Character mistake: Both in the title and throughout the episode, people refer to 'Lord John Marbury'. However, the first names of peers are not used when also using their titles; so Marbury should be called either Lord Marbury (more accurately Earl Marbury), or just John Marbury. A minor error in the real world, but the White House is supposed to be aware of diplomatic eccentricities like this.

The West Wing (1999)
1 mistake in Lord John Marbury - chronological order
Starring: Martin Sheen, Allison Janney, Rob Lowe, Bradley Whitford, Stockard Channing, Richard Schiff, Dulé Hill, John Spencer, Janel Moloney, Joshua Malina
Genres: Drama
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Trivia: Martin Sheen also played the President in the mini series "Kennedy" and in another character's vision in 1983's The Dead Zone.
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Answer: It's in reference to the many televangelists and revival ministers usually associated with the right-wing that have been convicted of tax fraud (Jim Bakker and Tamy Faye being a more famous set). Occasionally, the more unscrupulous ministers have bilked millions from believers all in the name of God.
Nikki