This is the part of presidential campaigning I always find interesting.
We want them to tell us what THEY would do, as president, to achieve their objectives. Because, they know that a lot of what they talk about is what they WANT and will try to SELL, but can't just dictate. That's not how it works.
On the other hand, we as an unruly mob, are prone to forget that and often WANT a president to tell us THEY will do X, Y, and Z.
You risk alienating the uninformed if you explain the limitations of the office and you risk alienating the informed if you overstate what you WILL do, if they know it's not in your power.

While some of his answers were a bit cautious (as I feel they should be) I was only worried when he started talking about whether or not the president already had the authority to just break up a bank. I think a defensive, "I'm going to look into it and do everything within my authority to break them up if they are determined too big to fail."