They're just like regular candidates, except they aren't on the ballot and (usually) have no money.
Most write-in candidates "campaign" by asking friends to vote for them; a few, however, have some limited financial resources and will try to campaign more traditionally, say, by putting up some signs.
One of the ways that campaigns with limited resources try to save money is to have signs that are only printed on one side.
Another way that campaigns (all campaigns, not just those of write-in candidates) look to save money is by using rebar as sign posts; it's less sturdy than the normally-used fence posts, but it's also less costly.
All of which is fine...until the downsides of one-sided and rebar combine -
|Found at the SE corner of Rural and Baseline in Tempe|
The candidate on the sign, Joe Hui, is an official write-in candidate for Corporation Commission.
Bonus "Fun with campaign signs":
I live in one of the few Democratic-leaning legislative districts in Maricopa County (LD24), which means that we see the Republican candidates who run on the "Republican? Who me?" platform -
|Found at McDowell and Hayden in Scottsdale|
run for office as "Republican-lite", but I'm fair about it - I don't have a high opinion of Republicans who run as "Democrat-lite", either.
Plus she is AWESOME. :)
Bonus2: Dear...well, *everyone* -
Spell check is your friend. Whether you are a candidate/campaign, or an anti-candidate/anti-campaign, whether it is a website, press release, campaign lit, or street sign, or something else, proof read everything before you send it out.
Including stickers that you attach to a candidate's signs -
|Found at McDowell and Hayden in Scottsdale.|
I think that they (whoever "they" may be) are trying to accuse Rep. Kyrsten Sinema of being an "atheist" here.
Not sure what an "athiest" is, though.