Bear in mind that this comes from the same cable channel last seen making jokes about three-ways and Rick Santorum earlier in the evening, but that’s not the fault of CNBC’s John Harwood. Harwood told Rachel Maddow last night that the main funder of Newt Gingrich’s super-PAC, casino owner Sheldon Adelson, has written his last check for Gingrich in this race: Visit msnbc.com for breaking news, world news, and news about the economyGreg Sargent spoke with the head of the super-PAC, Rick Tyler, who acknowledged that he’s in for some rough days ahead: The key question is whether the pro-Newt...