[August]

The Congressional disapproval rate is pretty much meaningless and you know it. For one thing it has hardly budged since the Democrats were in control showing it's no indication of party preferences and secondly however much they hate Congress as a group 85% of people still tend to reelect their own Senators and Congressmen anyways.

You also completely ignore the Republican gains in state Governorships, many in deep blue states. To me that's a far more telling sign of which party the voters are currently leaning towards.