Scott Horton of Harper's Magazine describes the extra-Constitutional activities in the Bush Administration: "We may not have realized it at the time, but in the period from late 2001-January 19, 2009, this country was a dictatorship."
A couple of additional links:
2009 Harper's index
Brian Tamanaha posits that Yoo, Bybee, et al. acted in bad faith in writing the memoranda that effectively placed the President above the law.