I don't really buy this, but if Donelly can get that much support, Heitkamp can win in a landslide.
And you’re only coming to this conclusion now because of this one sketchy poll, as if that was ever in doubt? Anyway, I think this is too D-friendly (Gravis was also way too generous to Bayh in 2016), though I’m sure Donnelly has a sizeable lead right now which will obviously (like in 2016) dwindle over the course of the GE campaign as we get closer to election day. Whether it will be enough for the Republican candidate to win remains to be seen.
I only say this because I never really considered Donelly winning by a comfortable margin, this being IN and all. But like I said, I don't buy the poll; I mean, it's Gravis after all.