McCain brought this on himself. There were lots of articles about McCain accepting campaign donations from telecommunications companies who had business before his commerce committee (airlines, too). The detail of the sexual tryst is just a red herring, the only lie in the story. McCain may not have always voted the way the companies expected, but the donations did buy them access, a pay to play kind of scheme.
Do a google search on and article from 1999 by Amy Silverman, called, “An Endowed Chair.”