I don't know for certain...just throwing it out there.
The vote turnout in El Paso County.
http://results.enr.clarityelections.com/CO/El_Paso/43055/110775/en/summary.html
O.K.
I thought the issue you were trying to make was Santorum won El Paso County in the primary so Santorum would have been a better candidate in Colorado, but Romney did not lose the county in the general election;
so what WAS your point