Ben Carson is an internationally renowned neurosurgeon, but a political novice. He only rejoined the Republican Party in 2014. He vehemently opposes Obama's health-care reform, comparing it to slavery. His right-wing views have made him a favorite of the tea party movement. Carson is the only African-American candidate in the presidential race.

Party: Republicans

Political experience: None

Age when taking office: 65

Campaign launch: May 3, 2015

Political positions:

+Increase defense spending

+Keep the Guantanamo prison open

-Opposes tougher gun laws

-Opposes Obama's health care reform

-Opposes higher taxes for the wealthy

-Opposes right to an abortion

-Opposes gay marriage