dr. benn carson and carly fiorina have very different backgrounds.a famous neurosurgeon and fiorina spent her career in business. neither have held office and both emphasize that's a good thing. it was an unusual way to announce a presidential campaign. >> i'm not a politician. i don't want to be a politician because -- (applause). >>> politicians do what is politically expedient. i want to do what is right. >> reporter: dr. benn carson retired neurosurgeon says his outsider status will serve him well in the race for the republican nomination. >> i don't have a lot of experience busting budgets and doing the kinds of things that have gotten us into all of the trouble that we're in now but i do have a lot of experience in solving problems. >> reporter: carly fiorina has never held elected office. she lost her senate race by 10 points. she says her extensive career in business rising from secretary to become the ceo of a fortune 500 company makes her a contender. >> i think i'm the best person for the job because i understand how the economy actually w