“...they are a true political team, joined at the hip...”
“Joined at the hip” doesn’t really seem to fit. Perhaps, “Cut from the same cloth”? “Birds of a feather”? “Kindred spirits”?
If either one suddenly retired and was never heard from again, I don’t see how the other would be affected, either negatively or positively.
Are you an idiot?
It seems that you don’t have any real input.