Who knew?
You can figure out who is in the tank for whom by looking at the graphics in the scandal stories.
http://www.huffingtonpost.com/2009/06/24/fox-news-identifi es-sanfo_n_220377.html (Fox tries to paint Sanford as a Democrat); http://www.mrc.org/biasalert/2009/20090626090106.aspx (ABC ignores party label of Conyers' wife).
Personally, I don't perceive Belen as a dead ringer for Jenny Sanford, any more than Britney Spears is a dead ringer for Paris Hilton. The Sanfords failed to invest in their relationship, and they got the ROI they deserved.