The video embedded above shows Fox News’s Martha MacCallum introducing a segment about the Obama administration's current view of the economy: “After weeks of economic doom and gloom, the Obama administration is now singing a slightly different tune."
She then played clips of Romer and other administration officials making seemingly positive comments about the current state of the economy. One of the clips was of Vice President Biden saying, “The fundamentals of the economy are strong! After the segment, MacCallum said, “All right, well the mantra for the weekend is clear, looking at what was said over the course of the shows on Sunday.”This is a complete fabrication; the clip of Biden's comments is not current. It was filmed six months ago during the presidential campaign. And he wasn't saying that he believed the fundamentals of the economy are strong. He was quoting John McCain - derisively.
It's not even subtle in the film clip - you can see a "Change we can believe in" sign behind him.
Update 03/17: FOX has apologized, stating that the use of the Biden clip was "inadvertent."