We lost the most political leftest on the SC so if anything it would be a 5-3 vote not a 4-4 vote. Unless that slime ball Roberts flips (again).
We could speculate what it is, threats to family or even his own life.
The enemy plays hardball and will use any means to get their agenda to play out.
Any stalemate in the Senate could be helped by the VP voting if only one vote is needed.