Why is CA purple on the bottom map? They have a 2/3 Rat majority in their legislature.
According to the theory, 67% and above would be sufficient for the entire delegation to be from the majority party. California has 66.3%. While California would likely be represented by one senator from each party, it wouldn’t be a stretch to say that the Democrat would be liberal and the Republican would be a moderate.
But it’s an educated guess, not precise political analysis. Even if the Republicans were only able to swing half of the states where they have reasonably sufficient support (according to the state legislatures) and we err on the side of the Democrats - which wouldn’t be too much of a stretch considering the inability of Republican leadership to stand on principles or oppose Democrat policies - the Republicans still gain control of the Senate.