The rats will not run sarbanes. Have you ever heard him talk? He absolutely cannot run a statewide election. He only won his house seat because it was a dem seat in a very dem year with the name of his father. He didn’t need to campaign. also, he is not next in line.
I would imagine that Van Hollen, Doug Gansler, or Hoyer would run.
He seems to have some sort of difficulty standing up to that segment of Maryland's Democrat party (well, it's more than a segment ~ they are the majority).
The way the Democrats select candidates it's probably some black guy in PG county who is in line for the opportunity to be a Senator. There are several likely candidates there and we'll be hearing about them in a couple of weeks.