The Colorado Springs March For Life prominently featured the city's Catholic community.
Justice Kennedy was a supporter of gay rights, but he also weighed in on the conservative side for cases such as Citizens United.
Former Governor Dick Lamm, who sponsored the legislation, says the emotional debate over the abortion issue has remained the same since 1967, but the differences then were less political and more religious than they are now.
Colorado was the first state to significantly loosen 1960s restrictions on legal abortions, six years before the U.S. Supreme Court legalized abortion nationwide.
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Under the bill, doctors performing abortions would have to have admitting privileges at a nearby hospital.
Opponents says Amendment 67 would ban all abortions in Colorado.