"...a lot of Republicans are fed up with his (Keyes) vanity campaigns and the gloves will come off in a way that they haven't before."
I wonder how many Republican conservatives know that one of Keyes' "vanity campaigns" was his campaign to be the Libertarian Party of New York's candidate for the US Senate in 1998? Keyes lost the Libertarian nomination - and so decided to once again be a Republican and run for President in 2000.
Alan Keyes - a "principled, committed," conservative wanting to run as a LIBERTARIAN from New York - and losing the nomination so he "reverts" to the Republican Party. Now, THAT sounds like a RINO.
BTW, adding to my earlier caution about you reading to much into that bogus story, Keyes could OWN the Constitution Party by now if he had been willing to leave the Republicans (and frankly, I often want him to do so and put that party on the map) and he has steadfastly refused to quit the GOP.
Methinks you are being mislead.