CREATE TABLE table_50826 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What is the margin of victory of the gna/glendale federal classic?
SELECT "Margin of victory" FROM table_50826 WHERE "Tournament" = 'gna/glendale federal classic'
SELECT "Margin of victory" FROM "table_50826" WHERE "Tournament" = 'gna/glendale federal classic'