...allowing elected officials to have a harem? That might keep people like Spitzer, Clinton, et al from going out in hiding and having their flings in secret. Could set the harem size according to the job: city councilman gets one woman, mayor two, state legislator three, governor six and president ten.
And think about how it would improve the candidates for office. Every man in the country would be clamoring to be elected, creating a greater pool of choices. We'd no longer have as many of the "vote for the lesser of two evil" choices, like we've had for President.
Of course, the official would still have the problem of getting his wife to go for it and would have to pay his own money for the harem upkeep.