Poor Biden and Richardson, their supporters went to Edwards and Obama when they didn't meet the 15% threshold. That would explain the underestimation I think.
I'm betting that O'Malley will likewise make a deal with Clinton about his own supporters too.
He has little leverage.
The deal would just be that their supporters would back each other in any precinct where one of them doesn't make viability. There will be far more precincts in which O'Malley doesn't make viability than in which Clinton doesn't, so this benefits her more than it benefits him. But at least if Clinton only ends up winning the state by a narrow margin over Sanders, O'Malley can say privately that he helped her win the state, and maybe she'll reward him with a Cabinet spot or something.
