They don’t want just another Obama….
Check it out:

Iowa Democratic leaders want something to happen during the caucuses; they want someone to challenge Hillary Clinton. They fear a “coronation” will deprive their voters­ of a discussion regarding the direction of the country. After all, this was a state that backed Obama in 2008 primaries and both presidential elections in 2008 and 2012. A lot of voters have seen this movie before concerning the inevitability/invincibility of Hillary Rodham Clinton.