The Ticket - S7-E1
Continuity mistake: This episode (after the library scene that takes place three years later), according to Josh, takes place four days after the National Democratic Convention shown in 6x22. Somehow in that 4 day period Josh's hair has grown considerably and Jed's hair has become much grayer.
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