Zell would win DC. Blacks are simply too partisan.
As an example, on the
wikipedia page for
George Wallace, Jr. it says that "Wallace lost the election in an upset to Everett by just 3,571 votes, less than 1%. It was largely believed that Wallace's loss was due partly to the shift of many African-American voters, particularly in Montgomery, to the newly drawn majority-minority 7th district which had been organized after the 1990 census in accordance with the Voting Rights Act."
(Later on the page it informs us that "In June 2005 he opened up the first day of the annual national convention of the Council of Conservative Citizens (CofCC), a conservative group that some critics describe as "white supremacist". This was not Wallace's first interaction with the CofCC; he gave speeches to the CofCC once in 1998 and twice in 1999. He has also appeared as a guest on The Political Cesspool, a white nationalist radio talk show that is affiliated with the Tennessee chapter of the CofCC.")