Number One suspects? Jeb Bush, and yes, the Koch Brothers. But they only went so far, then dropped it long before Christopher Steele ever came onto the scene, and GPS Fusion shopped out the project to several willing prospects.
One of several, which were Russian interests, and another, the Hillary Clinton campaign people, more probably through the John Podesta connection. The Deep State operatives at the FBI, Mueller, Rosenstein and Comey, were apprised of the plot early on, so they could shepherd the process, APPEARING to maintain an “investigation”, but mostly running interference so as little as possible of this whole enterprise would be likely to be seen from the outside.
And you know, if Herself had won the election, NONE of this would have surfaced.
But a funny thing happened on the way to the Forum....
Sounds like something Kasich would do.