Newt Gingrich, Republican candidate for the presidency of the USA, was caught cheating, and then asked his wife, Marianne, for an open marriage:

She said when Gingrich admitted to a six-year affair with a Congressional aide, he asked her if she would share him with the other woman, Callista.

Riiiiiiiiight. This is not polyamory. This is cheating. The difference, in case you missed it, is consent. (Also, polyamory and open relationships are not the same thing.)

TRiG.