The Back of the shirt has some of his popular quotes from various events:

I will never forget that the only reason I'm standing here today is because somebody, somewhere stood up for me when it was risky. Stood up when it was hard. Stood up when it wasn't popular. And because that somebody stood up, a few more stood up. And then a few thousand stood up. And then a few million stood up. And standing up, with courage and clear purpose, they somehow managed to change the world.

BARACK OBAMA, speech, Jan. 8, 2008

We should be more modest in our belief that we can impose democracy on a country through military force. In the past, it has been movements for freedom from within tyrannical regimes that have led to flourishing democracies; movements that continue today. This doesn’t mean abandoning our values and ideals; wherever we can, it’s in our interest to help foster democracy through the diplomatic and economic resources at our disposal. But even as we provide such help, we should be clear that the institutions of democracy – free markets, a free press, a strong civil society – cannot be built overnight, and they cannot be built at the end of a barrel of a gun. And so we must realize that the freedoms FDR once spoke of – especially freedom from want and freedom from fear – do not just come from deposing a tyrant and handing out ballots; they are only realized once the personal and material security of a people is ensured as well.

BARACK OBAMA, speech, Nov. 20, 2006

I always believe that ultimately, if people are paying attention, then we get good government and good leadership. And when we get lazy, as a democracy and civically start taking shortcuts, then it results in bad government and politics.

BARACK OBAMA, MSNBC interview, Sep. 25, 2006

The true test of the American ideal is whether we’re able to recognize our failings and then rise together to meet the challenges of our time. Whether we allow ourselves to be shaped by events and history, or whether we act to shape them. Whether chance of birth or circumstance decides life’s big winners and losers, or whether we build a community where, at the very least, everyone has a chance to work hard, get ahead, and reach their dreams.

BARACK OBAMA, speech, Jun. 4, 2005

The best judge of whether or not a country is going to develop is how it treats its women. If it's educating its girls, if women have equal rights, that country is going to move forward. But if women are oppressed and abused and illiterate, then they're going to fall behind.

BARACK OBAMA, Ladies' Home Journal, Sep. 2008

America is a land of big dreamers and big hopes. It is this hope that has sustained us through revolution and civil war, depression and world war, a struggle for civil and social rights and the brink of nuclear crisis. And it is because our dreamers dreamed that we have emerged from each challenge more united, more prosperous, and more admired than before.

BARACK OBAMA, speech, Jun. 4, 2005

All across the world, in every kind of environment and region known to man, increasingly dangerous weather patterns and devastating storms are abruptly putting an end to the long-running debate over whether or not climate change is real. Not only is it real, it's here, and its effects are giving rise to a frighteningly new global phenomenon: the man-made natural disaster.

BARACK OBAMA, speech, Apr. 3, 2006

Hope is what led a band of colonists to rise up against an empire; what led the greatest of generations to free a continent and heal a nation; what led young women and young men to sit at lunch counters and brave fire hoses and march through Selma and Montgomery for freedom's cause. Hope is what led me here today--with a father from Kenya, a mother from Kansas; and a story that could only happen in the United States of America. Hope is the bedrock of this nation; the belief that our destiny will not be written for us, but by us; by all those men and women who are not content to settle for the world as it is; who have courage to remake the world as it should be.