One of the key entry points for disinformation campaigns are small communities with individuals sympathetic to the propaganda/misinformation. 10 or 15 sock puppet accounts pushing the same narrative will have an outsized impact on the discourse of a community like ours.
The sympathetic individuals then multiply the propaganda and spread it to more mainstream platforms.
It should also be noted that in first past the post voting voter suppression of one candidate is as effective or even more effective than convincing someone to vote for the other.