If you don't get a campus leadership position or a job you really want, talk to the person who interviewed you or reviewed your application, thank them, and then ask them what you can do in the future to be a part of this organisation or to be better qualified for this position. Take note of what you hear. The interviewer will be pleasantly surprised that you went out of your way to find out why you didn't get the job, that you're open to feedback, and that you're eager to learn. You'll stand out from the crowd, and then you can apply again. Or, if someone is unable to perform their duties and must be replaced, guess who they will consider?

You.