I think Clinton winning in NV might marginally help Rubio since polls are still open in SC.
Why would Clinton winning in NV help Rubio?
I think that he is saying that people may vote for Rubio rather than their preferred candidate, like Trump or Cruz due to fear that neither of them can beat her in November. Many people believe (including myself) that Rubio is generally more electable than either of them.
Hes not.
Cruz however does have a ceiling more so than Trump whos basically a independent running on the gops side