Assertion: constitution's amendment | /r/CapableOf | prohibit same-sex marriage
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Source sentences:
text: In recent years, some of these have been both controversial and high-profile, such as legalizing commercial gambling in 1993, Missouri Constitutional Amendment 2 (2006) (allowing the production of human embryos for stem cell research), Missouri Constitutional Amendment 2 (2004) (an amendment prohibiting same-sex marriage), and an English-only amendment in 2008.