Millions of Americans take part in NCAA March Madness each year, including politicians and celebrities.
Some Republicans have criticized Obama for releasing his bracket but it's important to note Republicans have participated in releasing their brackets in recent years, as well.
In 2008, Arizona Republican senator and presidential nominee John McCain made his bracket picks and sponsored a contest on his website. He made his '09 bracket public, too. Republican presidential candidate Mitt Romney declined to fill out an NCAA bracket in 2012 because he wasn't plugged into college basketball that season, not because he didn't think it should be done at all. Obama has released his picks each year of his presidency.