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.