If you go back and look at November 2012 his job approval went up when Christie bear-hugged him. I have never understood why it went back up after he was re-elected and stayed up as long as it has, but his approval (actually unapproval) is starting to track Nixon. Nixon stayed higher than it should for almost a year after the report of Watergate first broke, but once he started to drop he kept dropping and never was able to recover.