This is certainly an absurd ruling.
And you can be quite sure that if it is appealed all the way up, the insane judges on SCOFLAw will decide it the same way.
They were overruled by SCOTUS in the chad wars, but I don't think the Supreme Court would likely interfere in a local state election.
I would presume that the district can and should be canvassed, and that mailings can be sent out. Also, I presume that people can carry signs informing voters at the legal distance from polling places. But it's important to get out the vote as well as inform voters who show up.
Doesn't a vote for a U.S. Senator count as a federal election?