Senator Kennedy inspired so many with his decades of service, so I can't think of a more fitting tribute then working to educate and motivate future generations of citizens and public servants alike.

The safe haven that al-Qaida has found in Pakistan is very troubling.

Every presidential candidate for decades has released his tax returns, and I've released 33 years of my tax returns. The American people deserve to know about our taxes. And so Donald Trump is standing in the way of precedent that goes back on both sides of aisle Democrats and Republicans, and he clearly has something that he doesn't want us to see.

I think science is real. And I think it's important that we grip this and deal with it, both at home and abroad.

In America, we will have secure borders, but we'll also have reform.

If you look at countries that are comparable, like Switzerland or Germany, for example, they have mixed systems. They don't have just a single-payer system, but they have very clear controls over budgeting and accountability.

Being human, we are imperfect. That's why we need each other. To catch each other when we falter. To encourage each other when we lose heart. Some may lead; others may follow; but none of us can go it alone.