evidence: At the Democratic National Convention and throughout Kamala Harris’s campaign for president, themes of joy and hope are resonant. Doug Emhoff refers to his wife as a "joyful warrior." In her speech to the convention, former First Lady Michelle Obama called attention to "the contagious power of hope, the anticipation, the energy, the exhilaration of once again being on the cusp of a brighter day." And in her acceptance speech for her party’s nomination, Ms. Harris promised to "be a president who unites us around our highest aspirations." Joy and hope have become a palpable force among Democrats—the image of Gus Walz pointing to his father, vice presidential nominee Tim Walz, and exclaiming, "That’s my dad!" as tears streamed down his face captures the emotion bringing together the party as it seeks to unite the nation. While Harris’s laugh has been the subject of mockery from former President Trump and others on the right, her joyful and enthusiastic presence evokes hope. Last night, she embraced the mantle and showed that true strength comes from compassion and joy, not enmity and fear, following her own advice: "Never let anyone tell you who you are. You show them who you are."