Proud to cast my ballot earlier today in the Delaware primary election. American democracy begins and ends at the ballot box. There is no more important civic duty nor fundamental right to be defended. Voting defines our freedom and makes everything possible. Today, on National Voter Registration Day, I hope every American will take a moment to make sure you are registered, ensure your information is up to date, and make a plan to vote this November. Do it at IWillVote.com. The work to secure our democracy and protect our fundamental rights and freedoms is not over in this country. Each generation must join the work to preserve our democratic values and norms. Start today. Get engaged. And together, we'll ensure American democracy lasts another 250 years and beyond.

Twenty-five years ago today, we lost 2,977 souls and in the years since, thousands more to illnesses caused by the attack on our country. This morning, Jill and I hold close the families who carry that loss every day. We honor the heroes of September 11th: the firefighters and police officers who rushed into the towers and the Pentagon, the passengers who fought back over Shanksville, and the generation that stepped up to serve in the aftermath. Even now, we remember the greatest lesson of one of our nation's darkest days: at our most vulnerable, unity is our most powerful strength. We will never forget.

I’ve said it my entire career: the middle class built America. And unions built the middle class. To every worker who's ever punched a clock, worked a double, or walked a line for fair wages – and to everyone who stands up for them, at the bargaining table, in the statehouse, or on the shop floor: thank you. This country runs in large part because of you.

Simply put, Dolly Parton was an American original. She was an inspiration to millions. She was a relentless advocate for women and for equality. Through her Imagination Library, she placed the gift of reading into the hands of millions of children because she understood literacy is the foundation of opportunity. But perhaps most importantly, Dolly treated everyone with kindness and respect. She lived her values with a flair and vitality for life that was uniquely her own. She was a trailblazer in every sense of the word, and she will be missed by millions around the world. Jill and I are keeping her family, her friends, and her millions of fans in our prayers. God bless Dolly Parton.

I’ve written a book about my time as President. It’s called PROMISE ME, AMERICA. It’s coming out November 17th and is available for preorder now.  promisemeamerica.com/ @littlebrown

Jill and I are shocked by the sudden passing of Lindsey Graham. Lindsey and I served together in Congress for over a decade, and worked closely on many issues throughout the years. We traveled the world together as members of the Senate Foreign Relations committee. We disagreed often, and sometimes loudly. Lindsey and I did agree on the profound importance of public service. Like me, he loved the Senate as an institution, even with all its flaws and complexities. To his family, his staff, his constituents in South Carolina, and everyone who loved him: Jill and I are keeping you in our prayers.