You're right about Clinton having to reach out to the Tsongas supporters in '92...and obviously they came on board, because the guy won (Perot helped by splitting the conservative vote). Back in '04, the Deaniacs pretty much got on board with Kerry, I think...at least, I didn't see any fallout in the results and the Dems *won* VT, ME, and NH, where one would expect dispirited Deanies to fall away (of course, Kerry was from New England, too). No, I think the big rift was in '84, when Gary Hart lost the nomination to Walter Mondale in a contentious primary season. Now, I do think either man would have been steamrollered by Reagan, but I think all the Hart supporters were pretty much able to get on board with Mondale, even though he didn't pick Hart, but Geraldine Ferrarro as his running mate.