As human, this is a serious issue and I am grateful that this was not a worse situation. I hope nothing but a speedy recovery to Bernie.
As a pundit, this is very bad for Bernie 2020. At 78 he'd be the oldest president elected should he be victorious. A campaign like this is predicated on him over-proving that health is not a viable issue. This puts a massive, possibly irreparable, dent in that idea.
In an election where "electability" is the number one issue, that's a harsh reality to comprehend for Bernie fans.
More so, there is a question that has lingered through the day on what the next steps are for Sanders. The campaign "postponed" their ad buy set to start tomorrow in Iowa.
I'll hold off on looking too far down the road until we get more information. Regardless, this is not the kind of news you'd want to follow such an overwhelming fundraising haul.