The following chart represents the Real Clear Politics national polling averages two days prior to Chris Christie's endorsement of Mitt Romney. At the time, Romney was narrowly in the lead with 23%.
The next chart represents the latest Real Clear Politics polling averages. As of now, Romney trails Newt Gingrich by 13 points with 20.8%
As you can see, Mitt has dropped more than two full points in the two months since Christie's endorsement, and a narrow lead has turned into a huge deficit to a man whose campaign was declared dead in June. Weren't we told by the experts that Chris Christie was the most popular Republican in the country, and that his seal of approval would seal the deal for Romney? What happened?