Calls for Alberto Gonzales to Resign

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Expert:

Dr. Kathryn Dunn Tenpas

Washington Semester Program director and adjunct associate

professor of political science, University of Pennsylvania

Credentials:

* Presidential scholar who studies White House operations and staffing

* Co-author "Explaining Increasing Turnover Rates Among Presidential Advisors," Journal of Politics

* Author of the book "Presidents as Candidates"