What Makes a Good Vice President?

A recent poll shows comela harris job approval at just forty three %. What are these responses basing their opinion on? I consider myself a political junky and have no idea what carmela is doing most of the time. In your opinion, what makes a good v p, and how should they be fairly judged? i actually think joe byden is a good example of what a good vice president is. He was impeccably loyal in public.