Phil Robertson Uses Spurious James Madison Quote to Explain His Support for Ted Cruz

Today, Duck Dynasty patriarch Phil Robertson used a spurious quote often attributed to James Madison to explain his support for Ted Cruz. Watch (see especially the segment starting at 1:30 into the clip)
[youtube]https://www.youtube.com/watch?v=CcfKyvOb38I[/youtube]
There is no such Madison quote about America being based on self-governance according to the 10 commandments. Even Ted Cruz’s historian, David Barton, now labels that quote “unconfirmed.” By all accounts, the quote cannot be found in any of Madison’s writings or can’t be traced to any primary source.
Someone should tell Phil Robertson that several of the quotes Barton used in his first book cannot be found in primary sources.