My misstatement.
It would give them 12 Senators instead of 2.
Without knowing the political demographics of current California or the proposed new states, I would figure that they would gerrymander the new states in such as manner as to decrease the Republican influence and increase the Democratic influence.
Otherwise, why bother?
Such a carving up would also impact the Electoral College voting in presidential elections.
Does anyone think they would intentionally create Republican strongholds?