How is this right?

This picture was taken at Kenmoor Middle school in Prince George's County Maryland. A county where I teach by the by:

And it's in the mail hallway at the school Now granted, PG is a liberal county and the education profession is liberal almost by definition these days. But how is this right? How can public schools paid by public funds have the right to post such blatant political posters? What would be the response if this was a line of posters of Mitt Romney? Or G.W. Bush? What are we doing in schools these days? Teaching our children life skills or indoctrinating politically? I'm not a Mitt Romney supporter by any stretch and I really don't want him to win. But this???? Really???? How can this be right???