It means joining with allies to deploy renewable energy technologies -- both at home and around the world -- to confront the very real and present danger of potentially irreversible climate change.

I don't think any sensible person would disagree that the invasion of Iraq led to the massive level of instability that we're seeing right now. I think that was one of the worst foreign policy blunders in the modern history of the United States.

If elected president I will have a litmus test in terms of my nominee to be a Supreme Court justice. And the nominee will say, we are going to overturn this disastrous decision on Citizens United because that decision is undermining American democracy. I do not believe that billionaires should be allowed to buy politicians.

We need to take a hard look at the war on drugs and the number of non-violent offenders who end up getting their lives destroyed by going to prison. We need to look at mandatory minimum sentencing and give judges more flexibility when there are issues of drug abuse or addiction.

There is a reason why these people [from Wall Street] are putting huge amounts of money into our political system. And in my view, it is undermining American democracy and it is allowing Congress to represent wealthy campaign contributors and not the working families of this country.

In the last presidential election Obama and Romney raised about $1 billion each. The Koch brothers, the second wealthiest family in America, now say they will raise nearly $1 billion for the 2016 elections. When one family can raise as much as an entire party, the system is broken. This is oligarchy, not democracy. We must overturn Citizens United.

We have to enforce the individual mandate. We're losing a lot of money that is not coming into the system.