Name Game

Has anyone noticed the campaign signs for Hillary Clinton? I actually came across it on the Simpsons but confirmed it in a Google image search and guess what? It says Hillary. Not Clinton.
I've noticed it's been the subject of some blogs (sorry I'm bad at doing all the hyper links, or maybe lazy is the better word) how she is referred to by her first name and not her last like all the other candidates and how this could be because of her gender and her not taken as seriously.

So now my question is that of the chicken and the egg. Has Ms. Clinton been campaigning as Hillary the entire time or has she fed into the fact that everyone has been referring to her as her first name and not her last.

I could see her wanting to identify as her first name and not her last since her husband's presidency was so recent and some may just equate Clinton with the scandalous part of his presidency or she may just want to have a name that is new and fresh and show that although she is married to former president Clinton she is in fact her own identity with her own motives and strengths.

What do you think?