Table: election_results_1986_6
Columns: district
incumbent
party
first_elected
result
candidates

Question: How many districts have Mac Sweeney as incumbent?
SQL: SELECT COUNT("candidates") FROM election_results_1986_6 WHERE "incumbent" = 'Mac Sweeney'

Question: Who are all the candidates vying for Henry B. Gonzalez' seat?
SQL: SELECT "candidates" FROM election_results_1986_6 WHERE "incumbent" = 'Henry B. Gonzalez'

Question: Name all the candidates vying for Albert Bustamante's seat.
SQL: SELECT "candidates" FROM election_results_1986_6 WHERE "incumbent" = 'Albert Bustamante'