Speaking about taking oath on Geeta, Tulsi Gabbard from Hawaii became the first congresswoman to take oath on Geeta during her inaugural:

http://www.deccanherald.com/content/302878/hindu-congresswoman-takes-oath-bhagavad.html

I respect the fact that she didn't find it necessary to convert to any other religion to get into American politics. Remember Jindal or Nikki Haley?