1. Transparency. We need to see where every dollar of the US federal gov't is spent. It needs to be on the internet, and it needs to be easily accessable. An exception can be made for classified spending in specific, but not so categorically (IE we spend X on classified stuff). Additionally, just like there is a Surgeon's General Warning on cigarette packages, there needs to be a link on every candidates webpage that lists their top 100 donors, and what industry they are in. This website URL needs to be easily visible and placed in every television and radio advert as well.
2. Investment banks cannot also be commercial (depository banks). Investment banks become partnerships where c-level owners are financially responsible for the actions of their banks. The banking system survived before things changed from this, and it will survive afterward.
3. There should be a small federal tax on the sale of any type of derivative, bond, stock, or other financial instrument every time it is sold. Say $.10 per share, every time. The financial markets are for raising capitol for companies, not for financial hackers to make money. HFT is a waste of time and energy, adds unnecessary volatility, and has yet to be shown to be anything more than tangentially related to the goals of a financial security market, established for the purpose of raising capitol.
4. The tax code needs to be simplified. There are a number of ways to do this, but the end goal should be to end loopholes that allow companies like exxon to pay no federal taxes. Or any company for that matter to realize losses in the US and gains in a foreign country.
5. Finally, there should be a 4 term limit on US Senators, and an 8 Term limit on US Representatives. Self-explanatory.