I hate to pour cold water on this, but perhaps this shows how far the internal poll has to pump up Biden’s share of the electorate to make this House race look competitive.
Nearly every poll has had Biden up double digits here. I don't think you understand what type of seat this is. Trump will be uniquely toxic here.
*shrug* I grew up not too far from there. Lower Bucks is more downscale white suburbia that has not shifted as much as the more affluent suburbs in Upper Bucks (in this district) and elsewhere outside Philadelphia. This is a really huge swing.