How have Barack Obama and his wife gotten their 40-million-dollar wealth and how do they spend it?

After winning re-election by defeating Republican opponent Mitt Romney, Obama was sworn in for a second term in 2013. During this term, he promoted inclusiveness for LGBT Americans. His administration filed briefs that urged the Supreme Court to strike down same-sex marriage bans as unconstitutional (United States v. Windsor and Obergefell v. Hodges); same-sex marriage was fully legalized in 2015 after the Court ruled that a same-sex marriage ban was unconstitutional in Obergefell