Yes...it's difficult to get any more extreme than Obama just with that vote in his history alone, and should be brought up and argued as such anytime someone in the media or the left calls Santorum or anyone else and extremist by comparison.
Remember, Santorum lost PA...a Catholic rust-belt state...by over 18% on virtually the same platform he espouses today.
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That is irrelevant today...or did you miss this: http://www.wnd.com/2012/02/poll-santorum-takes-1st-national-lead/