Philadelphia once comprised six congressional districts. However, as a result of the city's declining population, it now has only four: the 1st district, represented by Bob Brady; the 2nd, represented by Chaka Fattah; the 8th, represented by Mike Fitzpatrick; and the 13th, represented by Brendan Boyle. All but Fitzpatrick are Democrats. Although they are usually swamped by Democrats in city, state and national elections, Republicans still have some support in the area, primarily in the northeast. A Republican represented a significant portion of Philadelphia in the House as late as 1983, and Sam Katz ran competitive mayoral races as the Republican nominee in both 1999 and 2003.

Answer this question, if possible (if impossible, reply "unanswerable"): Who was the last Republican to be fairly competitive in the mayoral race?
Sam Katz