While it's worthwhile noting that the GOP campaign with by far the most bucks (Jeb!) remains in the cellar, of more note in this article is the idea that billionaire backs of the various and sundry Republican candidates felt burned by the overpromised failure of Romney in 2012, and therefore are mounting their own superPACs, to retain over their money.
It's interesting because it increases the voices of individual billionaires (just the way the Supreme Court wanted to encourage) (and so highlights exactly how the outsized voices of said billionaires are getting extra "free speech") but it also makes a unified message a lot more difficult for the candidates than ever before.
The 2016 campaign is going to be very interesting, even beyond the politics involved.
Republican Billionaires Just Can’t Seem to Buy This Election
Money has poured into the political system. And yet spending the cash haul effectively has never been more difficult.
HE CAN WIN. "Nationwide opinion polling for the United States presidential election 2016", from Wikipedia, the free encyclopedia.
+Plinio Cabrera I certainly wouldn't rule Jeb! out yet, but unlike Mitt Romney in 2012, who was always running second behind the flavor of the day, Jeb! is steadily sinking in the polls without much sign of recovering.