Consigliore?

It's an Italian word. I think it means counselor but I'm sure someone will come along and clarify.

First, a little correction: The correct spelling is "consigliere", not "consigliore"

As Jespah says, it is an Italian word, and it does mean "counsellor" in Italian. Additionally, when used in English, consigliere has the specific connotation of "counsellor to a Mafia boss". Are you familiar with the world of American movies and TV? Tom Hagen in The Godfather and Silvio Dante in The Sopranos are both consiglieri.

By calling Baker a consigliere rather than an adviser, the author in fansy's example is hinting that the Bush family is something like a Mafia clan.