Here are links to some information related to the CAGNY presentation:
Here is a link to the wikipedia page on heteroskedastic-consistent standard errors (aka sandwich).
Here is a spreadsheet where you can see how to perform the sandwich equation, even using weighted least squares.
Here is some r code for performing the sandwich equation.
Here is the election article discussed at CAGNY.
Here is the original article that received media coverage.
Here is a FAQ I wrote related to the election.