My guess is Pat Buchanan, who was in the Nixon White House at the time. He seems like the type that would be willing to do it, too. Buchanan has never had a problem with pissing off his fellow Republicans if he feels it's for the good of the country.

Where is Linda Lovelace, when you need her?

Deep Throat is an oral sex simulator sold at sex toy parties, not that I ever hosted one...

tremendously intriguing mystery

I think deep throat is not one individual or he would have been named already.

I think the information came from more than one source.

Just my thoughts...