The 2016 presidential race heats up this week as Dr. Ben Carson and Carly Fiorina launch their president campaigns today. On Tuesday, Mike Huckabee is expected to also enter the race for the White House, doubling the number of Republican candidates to six. Last week, Vermont Senator Bernie Sanders announced his presidential campaign, running as a Democrat against Hillary Clinton. Together with Ted Cruz, Rand Paul and Marco Rubio, the field on contenders is expanding with more to follow as the first GOP presidential debate in August draws closer. Some 21 Republicans are expected to run national campaigns along with several other Democrats.