1.   And in the April election, they split their votes between Mandela and the white incumbent, F. W. de Klerk.

2.   Bishop defeated a vulnerable white incumbent in the Democratic primary, and then cruised to victory in the general election.

3.   But Democrats have argued that districts should not be redrawn just to politically eliminate white incumbents such as Rep. Ken Bentsen, D-Houston.

4.   Civil rights leaders said that black incumbents benefited along with white incumbents.

5.   Shortly thereafter, an African-American alderman defeated a white incumbent, giving the city council its first African-American majority.

6.   The state lawmakers also knew that with the GOP surging in Texas, white Democratic incumbents like Rep. Martin Frost and Rep. John Bryant were an endangered species.