I had two calls from this number when I got home today.  All it says is "Pennsylvania" and the number; the exchange indicates that it's from the Pittsburgh area.  I'm thinking that, with the Pennsylvania primary election coming up, it's a political call.  While I know that those are permitted under the Do Not Call laws, I think that all political type calls should come up as "political" or the name of the candidate as the caller.  Please note that I'm not sure if this was from a candidate or a special interest group - it's just a hunch that I have.