Midterm elections are always a referendum on the president in power. 2018 the midterms went very blue in response to Trump. This year it’s redder in Response to Biden. This stuff doesn’t happen in a vacuum.

Ironically, because states like Florida and Texas can gerrymander their districts and California and NY can’t, it’s very possible Dems are losing the house specifically because we’re fairer to voters than most red states.