For propagating memetic artwork.
Slogans such as "The 99%" and "Occupy", while effectively crowd-sourced, did not come out of a vacuum... they were the result of clever Twitter and (online) poster-making campaigns... The key would be to figure out if it was just a miniature DUzy thread, though, or whether folks would actually attempt to spread stuff around (political posters submitted) if it was popular on an art thread here. 
I've seen so much great art and sloganeering that never made it off DU.
Also keeping in mind the fact that Occupy is not about voting but about street change so is not a partisan movement, this will help address the issue of criticism during an election year. Occupy Underground group is for the DU community, not an "organized Democratic group attempting to co-opt the Occupy label" so it's in keeping with the Occupy ethos that we're not targeting specific candidates for criticism when the whole system is broken and focusing on the horse race comes at a price. Folks will hopefully be aware that there's tons of Occupy supporters and supporters of fundamental change that have come thru DU over the past year and hence the site's name
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