Endeavors succeed or fail because of the people involved.

Perpetual optimism is a force multiplier.

I can't deny that it will be a historic event for an African-American to become president. And should that happen, all Americans should be proud - not just African-Americans, but all Americans - that we have reached this point in our national history where such a thing could happen. It will also not only electrify our country, I think it'll electrify the world.

I don't want to spend the rest of my life giving speeches.

I am confident that we will find evidence that makes it clear he had weapons of mass destruction.

How often have we seen politicians take a principle position only to give it up three days later? That is what makes democracy so fascinating.

I want to see policies that encourage every American to vote, not make it more difficult to vote.