The closest previous margin of victory in a GOP presidential contest was 257 in 1936 , when Alf Landon won the 1936 South Dakota primary . Romney vows to keep his campaign focused on defeating Obama Margin of victory is closest ever for GOP presidential contest . Santorum 's campaign says he proved he 's the only conservative who can beat Romney McCain to endorse Romney , senior GOP source says . Paul says `` the message of liberty is appealing to everybody '' not just those with a libertarian bent but also people from all walks of life and across party lines.
Romney vows to keep his campaign focused on defeating Obama Margin of victory is closest ever for GOP presidential contest . Santorum 's campaign says he proved he 's the only conservative who can beat Romney McCain to endorse Romney , senior GOP source says . Paul says `` the message of liberty is appealing to everybody '' not just those with a libertarian bent but also people from all walks of life and across party lines.