CREATE TABLE table_749 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who is the incumbent candidate in the election of percy priest (d) 90.8% robert m. donihi (r) 9.2%?
SELECT "Incumbent" FROM table_749 WHERE "Candidates" = 'Percy Priest (D) 90.8% Robert M. Donihi (R) 9.2%'
SELECT "Incumbent" FROM "table_749" WHERE "Candidates" = 'Percy Priest (D) 90.8% Robert M. Donihi (R) 9.2%'