If Trump can expand and polish his message, his momentum will continue. If he is repetitive, he will wear thin.
They are all repetitive. Pick any candidate for 2 weeks and watch every speech you can. It will be the same sound bites speech after speech.
All the candidates have a stump speech - they don’t write new ones for each campaign stop. I got sick of hearing Romney in 2012 - every speech was the same as the last one. They don’t have time to change their message. Anyway, Trump speaks off the cuff -you never know what he is going to say. Some are politically ignorant.