Wendy K. Tam Cho is Associate Professor in the Departments of Political Science and Statistics and Senior Research Scientist at the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign. 361 lincoln hall . 702 s. wright st . urbana, il 61801 217 333 9588 . 217 244 5712 fax . wendycho@uiuc.edu