MANCHESTER, N.H. — On the eve of the primary, the Clinton campaign on several fronts seemed to well over with emotion, making us wonder as we reviewed those video moments whether the sentiments – ranging from anger to near despair to exhaustion – would be in evidence as returns came in Tuesday night.It’s been a tough few weeks for the Clinton campaign, as the realization sunk in that her lead had slipped away around here. It feels like the tightly spun machine has come a bit unwound.