CREATE TABLE table_65127 ("Result" TEXT, "Barack Obama" TEXT, "George H. W. Bush" TEXT, "Ronald Reagan" TEXT, "Jimmy Carter" TEXT, "Gerald Ford" TEXT, "Richard Nixon" TEXT)

What percent of respondents had no opinion on George H.W. Bush?
SELECT "George H. W. Bush" FROM table_65127 WHERE "Result" = 'no opinion'
SELECT "George H. W. Bush" FROM "table_65127" WHERE "Result" = 'no opinion'