Hypocrite

A person who preaches virtue while swimming in vice.

See, e.g.:

Gingrich, Newt (espouses Christian virtues and values while undertaking 3 marriages, interspersed with overlapping affairs)

Giuliani, Rudolph (espoused Christian virtues and values while undertaking 3 marriages, interspersed with overlapping affairs)

Haggard, Ted (preached against drug use, homosexuality and adultery while having a homosexual affair with a meth-dealing gay escort)

Hyde, Henry (sought to impeach President Bill Clinton for adulterous behavior, when he had had at least one adulterous affair during his marriage)

Livingston, Bob (sought to impeach President Bill Clinton for adulterous behavior, when he had had at least one adulterous affair during his marriage)

Mehlman, Ken (gay man who is head of the anti-gay Republican National Commitee)

Swaggart, Jimmy (preached Christian virtues while having multiple affairs outside his marriage)

ad infinitum