It appears there is a good chance that no republican Presidential candidate will have a majority of committed delegates at the end of the primary process in June. That could lead to an “open convention” in Cleveland in July.
South Dakota Senator John Thune is optimistic that the process will resolve itself with a strong candidate

Thune says he won’t guess if any candidate has an inside track at this point

Thune says he is not going to endorse a candidate, at this point

Thune says the leading candidate in both parties have high negative poll ratings, which adds to the unpredictability.