No, I do stand by what I said. Romney was leading up until shortly beforehand (I was up there in MA during the last weeks of the election, so I could see it from "street-level", so to speak). Weld was absolutely terrified at the prospect of a Romney victory because the spotlight would've been off him as the leading Massachusetts Republican. Romney was cut loose, and you could tell something was WRONG in the last 2 weeks of the campaign. Weld could've shed 1 out of 5 of his voters and Romney still would've beaten Teddy. I very much do hold Weld responsible for the loss.
Well, I wasn't in Mass. in 1994, but I remember that Kennedy took the lead like 6-8 weeks before the election and never looked back (Kennedy's move came after that visit by Clinton in which Kennedy said "after you reelect old Kennedy you'll reelect Bill Clinton, as unelectable as the rest of us," the last few words being badly mumbled and Clinton with a smug smirk throughout---Rush Limbaugh must have played that clip, at all speeds and frontwards and backwards, at least a dozen times in one TV show). Romney only had a 3% or so lead at his peak, and it was with a lot of undecideds, so I don't think Romney ever polled above the 41% he ended up getting.
Weld won 71%-28% in 1994, but that's because the Democrats abandoned their hapless nominee. Romney's opponent was Ted Kennedy, whom we know as a disgusting, drunken ultraliberal misogynist who should have been imprisioned for killing Mary Jo Kopechne but whom, among Massachusetts Democrats, is the keeper of the Kennedy legacy. It was easy for Weld to convince Democrats to vote for him over a nobody; it would have been much more difficult for Weld to convince Democrats to vote for Romney over Ted Kennedy. Romney ran one hell of a race to get 41%, but even had Weld stopped campaigning for Governor and gone around the state stumping for Romney it would not have been enough. Weld is a rat for not having backed Romney more strongly, but I don't think a victory in the MA Senate race that year was in the cards.