What BS from CBS! They are scared!
The historical reason for losing seat IMO has more to do with the “winning” president and his party not keeping the promises they made during the campaign, IOW buyers remorse. That can not be said of President Trump, that doesn’t mean the middle of the road types(you know what happens when you stand in the middle of the road) who voted for Trump will not vote dim or stay home, and lead to dim take over of house. Just my opinion