Pornography taints everything it touches. Mitt Romney should have understood that. So should the Marriott Corporation and other hotel owners who offer hard-core movies in hotel rooms. Romney caught a bit of flack last week because he spent nearly 10 years on the Marriott board and yet never tried to reverse the company's policy of providing pornography on demand, something J.W. "Bill" Marriott Jr., defended in a 2000 letter as being economically important. The corporation controls only a few of the hotels with its name on them. For a presidential candidate who has railed against pornography, this is not entirely...