What does an upside down cross signify?

http://www.npr.org/templates/story/story.php?storyId=16726577  (Giuliani asks Romney about illegals at his mansion, and it happened again last week in the year 2011???)  ...cal
Excerpt:

Giuliani, Romney Square Off in YouTube Debate

by Mara Liasson

November 29, 2007

Listen to the Story

Morning Edition

November 29, 2007

Republican presidential rivals Rudy Giuliani and Mitt Romney went head-to-head on the issue of immigration Wednesday during a CNN/YouTube debate in St. Petersburg, Fla.

http://rhchatlienblog.blogspot.com/ 
(Do you see the inverted cross to the right in the above blog?  I just looked at email and saw something written by Ruth Hull and looked her up.........  I read a few things of hers before I noticed the cross and liked her stuffs.  hmmmmmm, but then I saw an ad for a military college. 
http://www.amu.apus.edu/

I didn't much like what she had to say in the email about Obama as I feel he didn't have choices when he was up against the Clintons and most of his people belong to the Billarys.  The
talk about impeachment makes me think the elites want Obama out of circulation.

I'm not even sure if the above Ruth Hull is the same person that wrote the email but I was a bit shocked to see the upside down cross on her page.   my2cents.)    ...cal

Excerpt:

http://en.wikipedia.org/wiki/Cross_of_St._Peter
Excerpt:

The Cross of St. Peter or Petrine Cross is an inverted Latin cross traditionally used as a Christian symbol, but in recent times also used widely as an anti-Christ symbol (a meaning which is not valid with respect to traditional conventions of Christian symbolism).