What did it mean in 2010? It's unusual for the Party holding the presidency to do well in the mid terms.
What will it mean when the 1/6 hearings go live and video after video, text after text, email after email and in person testimonies reveal that Trump did conspire with aids and GOP congressmen to overturn the election results?
Imagine the footage available to Dems at every level to use to rightfully brand their opponents as supporters of treasonous behavior.