The South Carolina Governor was a tea party favorite and this endorsement is not going to sit well with those who elected her. I was pretty surprised about it myself.
More on that here: http://www.reuters.com/article/2012/01/02/us-usa-campaign-southcarolina-haley-idUSTRE8010PE20120102
More on that here: http://www.reuters.com/article/2012/01/02/us-usa-campaign-southcarolina-haley-idUSTRE8010PE20120102