There is a third explanation, which is actually the logical explanation. Mitch McConnell blocked the House bill that was rewritten after Trump demanded that Americans receive a $2,000 check, instead of the $600 checks that were sent out.

So, those in GA who were in dire straits had to make Mitch the minority leader so the bill would not continue to be blocked. Biden promised the $1,400 checks if both Ossoff & Warnock won because Schumer would become majority leader and Mitch would no longer have the power to block the bill.

Also, demographic change. GA was trending blue for a while now, especially because the majority of new 18+ voters are heavily Democratic voters. GA is not alone demographic changes are heading for Texas next.

If the establishment GOP continues to support corporations over people, and they do not start coming up with popular policies of their own they may never win a Presidential election for the next few generations. Once we lose Texas, our party is fucked!