Say you have a judge, let's just call her "Amy Coney Barrett" for the sake of argument.

When a Black, democratic president named say, "Barack Obama", tries to fill a vacant seat on the 7th circuit you block his nominee and then have her installed by a Republican president.

THEN you block that very same "Barack Obama" Supreme Court nominee, get old Anthony Kennedy to resign for a favor, slide a monster in Kavanaugh in and when a Ruth Bader Ginsberg dies, you push in that same "Amy Coney Barrett" from the 7th circuit you packed to replace the late Justice and you do it DURING an election.

That but one example of court packing