After saying last year that it was up to the states, the Democratic hopeful forcefully backs constitutional right.
As violence spread Monday afternoon and into the night, Obama remained silent.
The crowded field called Tuesday for peace in the shaken city.
The two nations agreed to strengthen a wide variety of links, including trade and military cooperation.
"...If people that I cared for were going to be married, of course I would go if they asked me to go,"
"Today is also a chance for Americans...to say thank you for all the things we love from Japan. Like karate and karaoke. Manga and anime. And, of course, emojis."
Call for higher wages comes with irony: Seven years ago, Democrats led push to privatize Capitol food service.
O'Malley cuts short Europe trip over Baltimore unrest; SCOTUS to hear gay marriage case today; Boehner doubts he can override Obama veto on Iran; another Sununu in N.H.; lobbying down in 1st Q.
The 2016 White House hopeful will return to his hometown on Tuesday, an aide said.
Former Florida governor huddled with top donors at a swanky Miami Beach resort ahead of another busy week of quasi-campaigning.