Before the Texas case the Court could have rejected appeals from the Trump campaign and voters saying it's a political issue, not for them.
Now any decision they make will be political. Yes, that was true before, but they could say not getting involved was the only way to not be political. Now they can't do that. They piss off the blue States, or they piss off the red States, and they can't split the baby.
Might as well do the right thing then.
This has nothing to do with pissing off red or blue states. It has to do with defending the constitution. Right vs wrong. Playing by the rules vs cheating. It