"The card was posted on Facebook last December 21 by a man named Joe St. John, who ran Mr. Santorum's campaign office in Rock Hill, South Carolina and has been described by news outlets as both a Santorum "campaign staffer" and "a district field representative with Santorum's campaign." Mr. Biundo said there were "four or five people" working on Mr. Santorum's South Carolina team in December."

from

http://www.politicker.com/2012/02/10/santorum-campaign-disavows-controversial-hanukkah-card/