Is Giuliani angling to be Gingrich’s VP?

Sure looks that way. Giuliani is now publicly criticizing Mitt Romney as a flip-flopper, and embracing Gingrich instead.

The problem is that Giuliani has a Romney problem. I.e., he's pretending to be a conservative when people know he's really a liberal.  Once he wanted to be president, Giuliani flip-flopped on gay rights - a lot.  He also flip-flopped on abortion.  In a very real way, Romney's reinvention is late to the game.  Rudy was the original chameleon.  And his embrace of Gingrich is just another effort to dispel a lifetime of liberalism.  Raw ambition can be an ugly thing.