Gingrich has declared war on Fox News, saying that he has been forced to rely on fair coverage from CNN, but that Fox News is "on Romney's side." So of course it's over for Gingrich. Even his top funder, casino billionaire Forgot Hisname, has been interviewed saying that he would love it if Gingrich won but that it's now obviously just not going to happen. Earlier he had said that he was only pumping the Gingrich campaign full of cash because he really didn't want Santorum to win, and now that Santorum has dropped out rather than face an embarrassing loss from his home state, Gingrich's main backer has no reason to stand behind him anymore. Indeed, his campaign is pretty sad already, it's really entirely a way to get Super Pac money so he can spend it pimping out his and his wife's books. Long live Gingrich, Gingrich RIP, see ya next time.
You might be saying, "but Santorum hasn't pledged his support of Romney yet, he could give his delegates to Gingrich," and that's really exactly what Santorum wants people to say. In Santorum's concession speech he said his fight wasn't over, and he still attended a campaign event with Pastor Superchristian Alsoforgothisname. He's not going to drop on his knees for Romney right away - it would make him look bad with his own supporters, especially after having just said that Romney is the worst republican to fight Obama and bemoaning how un-conservative Romney is. But Santorum also wants Romney to work for his support, which will be vital in the general, not just to clinch the primary. Gingrich will call out for Santorum's support and Santorum will entertain the idea, but Republicans don't like a ruiner and supporting Gingrich so close to the convention when Romney is so close to the finish line, would be a disaster.
Meanwhile, Romney has chilled his extreme pandering to the right and is trying to appear more centrist in preparation for the general. You'll see him talking about "Obama's war on women," pointing out that many women have lost their jobs since Obama took office (of course ignoring the Lilly Ledbetter Fair Pay act and his appointment of two female Supreme Court Justices), and he will speak louder about how the problem with national health care reform is that it takes away from the individual state's rights to pass their own health care reform laws (as opposed to the problem with national health care reform being that it amounts to socialism or "reparations").