Richard L. Hasen, "Too Plain for Argument?" The Uncertain Congressional Power to Require Parties to Choose Presidential Nominees Through Direct and Equal Primaries,
102 Nw. U. L. Rev. 2009 (2008); 102 Nw. U. L. Rev. Colloquy 253 (2008), http://www.law.northwestern.edu/lawreview/colloquy/2008/10.