Who benefits as Christie ends presidential bid before Iowa caucus?

Hours before Nikki Haley and Ron DeSantis took to the debate stage in Iowa on Wednesday night, more than 1,000 miles away in New Hampshire Chris Christie shocked his supporters by announcing he was dropping out of the race. The former New Jersey governor was the only candidate to consistently attack Donald Trump, in a field of Republicans trying to beat the former president, all the while keeping his base sweet. With only three days until the Iowa caucus, Jonathan Freedland speaks to Elaine Kamarck about who is most likely to come out on top