CREATE TABLE table_2698 ("Constituency" TEXT, "Winner" TEXT, "Party" TEXT, "Margin" FLOAT, "Runner-up a" TEXT, "Party a" TEXT)

What party won with a margin of 105731?
SELECT "Party" FROM table_2698 WHERE "Margin" = '105731'
SELECT "Party" FROM "table_2698" WHERE "Margin" = '105731'