Here's some more:
All the resignations were over President Clinton's decision to sign a welfare bill that the officials thought would be a disaster for the poor and the country. Even more remarkable: Two of these officials chose not only to make a statement of principle but to do so in a way that was about as loyal to Clinton as they could be under the circumstances. They did not quit until after the Democratic National Convention, thus minimizing the political damage their resignations might cause the president. Clearly these were people interested in making a point, not in garnering maximum publicity for themselves.
The resignations of top Department of Health and Human Services officials Peter Edelman, Mary Jo Bane and Wendell Primus Edelman and Bane quit last Wednesday, Primus earlier
http://www.courses.psu.edu/hd_fs/hd_fs597_rxj9/resigning.htm
And I forgot:
Henry Cisneros
Webb Hubbell
Mike Espy
William Kennedy III (helicopter trip!)
the surgeon general....what was her name?
http://www.washingtonpost.com/wp-srv/politics/special/cisneros/stories/cis031595a.htm
OH, yes....Hubbell.
Rolling over one more time...
Sorry for posting Cisneros before reading more replies, I see you list him, Hubbell and MORE.