What's the best tax policy?

Imagine that you are the economic advisor to a political candidate who is trying to decide about tax policy. She asks you to prepare a one paragraph position paper on each of the following:

1. Based on the distribution of personal income (Table 2.4), should US taxes be adjusted to be:
   1. More progressive;
   2. More regressive
   3. Keep the distribution the same?

2. Which US taxes should be adjusted to achieve the outcome you describe in question one?