I got the following list from La Javert's page. For the full effect, try to imagine them singing the songs...
Jean Valjean -- Neil Young
Javert -- Gilbert Gottfried
Fantine -- Boris Yeltsin
Factory Girl -- Michael Jackson
Thenardier -- Marilyn Manson
Mme. Thenardier -- Howard Stern
Little Cosette and Little Eponine -- The Olsen Twins
Marius -- Meatloaf
Enjolras -- Dan Quayle
Gavroche -- Whoopi Goldberg
Grantaire -- Rodney Dangerfield
Cosette -- Chris Farley
Eponine -- Fergie
