"I will be successful in this position because I am passionate about what your organization stands for and highly skilled at writing engaging email copy. I understand the company's vision and have already drafted some great ideas to share with you. My organizational skills will also be a major asset, and I have a strong track record of increasing consumer responses to email campaigns."

When answering this question, focus on making connections between the job description and your resume and personal attributes. Do this subtlety by reviewing the job description ahead of time and picking out keywords that you can weave into your answer. This is a question that lets you shine, and you should strive to sell yourself.