Abu el Banat - S5-E9
Continuity mistake: When the president is in the oval office with the first lady and they are called by Charlie to receive their daughter Liz, the office does not have a Christmas tree, however, in the next scene when he leaves his grandson to go with Leo and C.J. to the office, the Christmas tree is already set up.
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