Why exactly did Murdoch's News Corp. give the GOP $1 million?

When Media Matters first highlighted reports that Rupert Murdoch's News Corp. -- the parent company of outlets like Fox News, Wall Street Journal and New York Post -- had given a $1 million contribution to the Republican Governors' Association, we noted the possible motivation behind the massive contribution:

According to the [Bloomberg] article, News Corp. is actually the RGA's “biggest corporate donor.” Bloomberg suggests that News Corp. has made these donations due to their opposition to “proposed federal rule changes that would weaken the position of its Fox network in negotiations with cable companies,” stating that “Governors may have a stake in the issue.”

Over on Newser.com's Off The Grid blog, Michael Wolff has even more to say about the possible motivation. He writes (emphasis added):

The notable thing about Rupert Murdoch donating a million bucks to the Republican Governors Association is not that he's risking general censure and opprobrium with this donation, but that he's donating money at all. Murdoch hates the idea of giving away money for nothing. The simple public relations idea of courting goodwill by donating an infinitesimal part of your wealth to a charity of your choice is anathema to Murdoch. He thinks the rich guys who do it are phonies. He's always irritated with his 102-year-old mother for supporting Australian charities—in this regard he rather thinks she's a phony.

[...]

Just say a little bird told me … the money doesn't come from Rupert.

The company is claiming the donation has nothing to do with its news side, going so far as to audaciously say, “There is a strict wall between business and editorial.” The “corporate side” made the donation, News Corp.'s hapless spokesman insists. But the central advocate for giving the dough has been none other than Fox Chief Roger Ailes. In the past, Ailes has been stymied or neutralized in his quest to have the company put its corporate money where its mouth is, because the No. 2 in the company until last summer, Peter Chernin, was a Democrat.

With Chernin gone, and with Fox News outperforming most other parts of the company, Ailes is the central voice. What's more, Chernin's sidekick, corporate PR-guy Gary Ginsberg, who could be counted on to use the threat of bad press to keep Murdoch from giving in to Ailes' none-too-politic schemes and demands, is also gone—purged, in part, by Ailes.