Dr. Ben Carson is the former head of pediatric neurosurgery at Johns Hopkins University in Baltimore, Maryland.
The Republican governor of New Jersey also wants to be president.
Ted Cruz is a senator from Texas.
Carly Fiorina is the only Republican woman so far running for president.
Bernie Sanders is a U.S. senator from Vermont.
Lincoln Chafee is a former senator and governor of the small state of Rhode Island.
The 2016 election is Hillary Clinton’s second run for the White House.
Martin O’Malley is a former governor of the state of Maryland and a former mayor of Baltimore, a city in Maryland.
Former Virginia Senator Jim Webb is a late addition to the group seeking the Democratic Party nomination for president.
Secretary of State John Kerry debated with members of the U.S. Senate Thursday in the first public hearing on the Iran nuclear deal.