Of course it is: We see this pretty easily in the physical space when there's really bad weather, like a blizzard that makes travel difficult for 3 days. Businesses see a bit of a pickup afterwards, as some purchases just get delayed, but there's A LOT of economic activity that disappears.
Imagine, for instance, that whoever processes credit cards for the Hillary campaign happened to have a catastrophic 4 hour outage around the last debate. Do you really think that the people that would have donated during the debate, or right after, are going to remember and donate just afterwards? I'd be very surprised of many didn't just give up at the time, and not remember to do the same, the day after.