Obama’s was at -12 on October 8 2010.
That’s when I knew the Democrats would lose the House. Obama’s unpopularity was a factor but what sank the Democrats was the Obamacare millstone around fheir necks.
By contrast the improving economy, world peace and the Kavanaugh confirmation is going to be the wind in the GOP sails . It doesn’t hurt it has the asset of a popular President, too.