The full list of material cited on tonight's show will appear here later, but for now here are the links Rachel mentioned specifically:
Party Polarization: 1879 - 2010
Ok, here we go. The full list:
Party Polarization: 1879 - 2010
Income Inequality and Political Polarization 1947-2009
The Purpose of Spectacular Wealth, According to a Spectacularly Wealthy Guy
Santorum wins Louisiana, flexing Southern muscle
Ron Paul supporters dominate Louisiana's Republican presidential caucuses
State GOP's caucus picks leave Romney slate slighted
Romney Wins Iowa Caucus by 8 Votes
Santorum wins Iowa, officially
Ron Paul backers sweep into GOP party roles in Iowa
Politico Mistakes State Flag for Union Flag, Idiocy Ensues