Mississippi Senator Thad Cochran's choice to retire may cause the GOP more hassle than they bargained for

This month, Mississippi's long-serving senior US Senator, Thad Cochran, announced that he would be retiring in April. Rolda Darlington writes that Cochran's resignation throws up a host of new challenges for the Republican Party, which is already on the back foot in the lead up to the 2018 midterm elections. With both of the Magnolia State's US Senate seats now in play in the fall, she writes, the Republican Party’s ambitions to retain control of the Senate look increasingly shaky.