The top 10 Senate races that are most likely to flip to the other party

(L-R) Sen. Raphael Warnock (D-Ga.), Sen. Catherine Cortez Masto (D-Nev.), Sen. Ron Johnson (R-Wis.)

The landscape has shifted.

When President Biden took office, it was widely believed that Republicans had a strong chance of taking back the House but, thanks to a friendly map for Democrats, the Senate was more competitive.

It was possible, if not likely, that Democrats — who control the Senate, which is split 50-50 — would retain the upper chamber and maybe even pick up a seat or two.