My family and I lived in Columbia, MO back in the late '60s...my dad was a Cards fan and went to the "Governor's Cup" pre-season game against the Chiefs in '69 - brought me back the program (still have it)...read that thing from cover-to-cover...Charley Johnson, MacArthur Lane, et al. However, my first football card ever was of Gary Cuozzo; he was the backup QB for Minnesota at the time, and since I was actually born in Minnesota, the Vikings were my favorite team along WITH the Cardinals. We moved to Indiana that year as well. In '72 the Cardinals made a really bad (!) trade with the Vikings that brought Cuozzo over - one year before he retired. That sealed the deal for me however as far as being a Cardinals fan. Even after Cuozzo became a dentist full-time.
I stopped liking the Vikings in '72...especially didn't like 'em after the '74 playoffs...I've remained a Cards fan everywhere I've lived - starting in Missouri, and continuing in Indiana, Texas, California, Illinois and now Colorado...
(of course my wife's from Minnesota, and her whole family are Vikings fans!)