May 3, 2015 – Campaign announcement video released
May 4, 2015 – Official candidacy announcement event in Detroit, Michigan
October 23, 2015 – Carson leads polls in Iowa by 9 percentage points over Trump
October 28, 2015 – Carson leads in national poll for the first time in months
November 17, 2015 – Trump takes back the lead in Republican polls
Check out Ben Carson’s status in the polls for the primaries here.