Perhaps you don't recognize using logic in the form of a question as using logic, but it most certainly is. Just a more subtle version of injecting logic into a conversation. It requires the person who answers to use logic to formulate their answer to the question. It required logic to formulate the questions where honest logical answers cannot be deployed. Not until the second place person can overtake the frontrunner. Until that point they are just wishful thinking.
The question requires the reader to make unfounded assumptions. It tries to force me to assume that Cruz can’t beat Trump. As the election is not over no one can accept that as fact. It also tries to force me to see the contest as being between two people, as it obviously is not. If the question had been why is Cruz not LEADING Trump it would have been an honest question that might have warranted a logical answer. As written it is BS.