The Senate seat that Jeff Sessions once held is now occupied by a Democrat. If Trump wins re-election but fails to hold the Senate, it will be nearly as bad as losing the presidency. If Republicans can retake the house and build a bigger Senate majority, it will make swamp draining and agenda setting much simpler. It will also help nullify pricks like Romney. This is why it would be huge if Sessions or a pro-Trump Republican can take back that seat.