Justin,
I assume you mean that you want additional information to be added to the "elected officials" panel along with UsCongressional, StateSenate, etc. If you look in the config.js file towards the bottom you should find the ElectedOfficialsTabData section. There you would just add another layer, reference the appropriate layer number in your mapservice, replace the "display Text" with whatever labels you want to appear, and put the field name fo the map layer that should appear inside the "${}" tag.
Sebastian Roberts
