CREATE TABLE table_72359 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Results" CLOB, "Candidates" CLOB)

What party does William J. Jefferson?
SELECT "Party" FROM table_72359 WHERE "Incumbent" = 'William J. Jefferson'
SELECT "Party" FROM "table_72359" WHERE "Incumbent" = 'William J. Jefferson'