CREATE TABLE table_690 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Status" TEXT, "Opponent" TEXT)

what's the party with opponent being marcy kaptur (d) 75.3% randy whitman (r) 24.7%
SELECT "Party" FROM table_690 WHERE "Opponent" = 'Marcy Kaptur (D) 75.3% Randy Whitman (R) 24.7%'
SELECT "Party" FROM "table_690" WHERE "Opponent" = 'Marcy Kaptur (D) 75.3% Randy Whitman (R) 24.7%'