Anyone but Cruz or Trump and they are going to have BIG problems with the base.. They will be Yuge!
ABCorT would indicate they are not really interested in winning and would more than happy to let Hillary have the WH.
They may think they can contain her because they have the Senate and House. That could be poor planning. If they relinquish the White House, they will likely also lose the Senate in November and lose the House by 2018.