Anyone who has ever attached a public IPv4 address to a server knows that they are immediately hit with drive by attacks of all sorts because it's just not that hard to attempt attacks against literally every possible IPv4 address.
It would be nice if CloudFlare could indicate whether the attacks they're claiming in this post are targeted or are just run of the mill drive by attacks.
Raw numbers don't really mean anything. How do the numbers of attacks against campaigns and election sites compare to those against other sites of similar reach? They do compare Senate and House campaign sites but I don't know if those differences are more likely to be due to how the drive by attackers prioritize their work (eg if a site appears on Twitter more often because a Senate campaign has a broader reach does it lead to more attacks)
Overall this post implies the attacks are related to the election but I don't see any real data indicating that they are targeted.