It works because he is leading in the polls and he brings disaffected democrats into the party.
Winning is the first step.
His attacks on Cruz are mild. They are all but a faint as are Cruz’s attacks or returns on Trump.
you are delusional if you think this is going to help him....in case you haven’t noticed, all the polls this weekend for him were horrible but one.....so this idea that he is great because polls and polls because he is great is a circular bit of middle school analysis.