CREATE TABLE table_40450 ("Constituency" TEXT, "Michael D. Higgins" TEXT, "Se\\u00e1n Gallagher" TEXT, "Martin McGuinness" TEXT, "Gay Mitchell" TEXT, "David Norris" TEXT, "Dana Rosemary Scallon" TEXT, "Mary Davis" TEXT)

What is the Martin McGuinness with a David Norris that is 10.3%?
SELECT "Martin McGuinness" FROM table_40450 WHERE "David Norris" = '10.3%'
SELECT "Martin McGuinness" FROM "table_40450" WHERE "David Norris" = '10.3%'