Premise: "A large crowd of spectators and photographers stands behind a barrier while two police officers stand guard."
Hypothesis: "A group of supporters is waiting for their favorite political candidate to emerge from a building."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:
The large crowd could be gathering for any reason that may not be waiting for their favorite political candidate. The may not be supporters and may not be by a building. So, the answer is it is not possible to tell.