Obama was re-elected President in November 2012, defeating Republican nominee Mitt Romney and sworn in for a second term on January 20, 2013. During his second term, Obama promoted domestic policies related to gun control in response to the Sandy Hook Elementary School shooting and called for full equality for LGBT Americans while his administration filed briefs which urged the Supreme Court to strike down the Defense of Marriage Act of 1996 and California's Proposition 8 as unconstitutional.