The Democratic National Convention in Chicago concluded with Vice President Kamala Harris emerging as the newly anointed Democratic presidential nominee, revitalizing a once demoralized party. However, as the confetti settles and the social media posts fade, the question remains whether this infectious energy can sustain a 74-day sprint to Election Day.

Harris, who gained an unexpected burst of momentum in recent weeks, has sparked newfound optimism among Democrats who now believe victory is within reach. Yet, the reality is that winning the swing voters needed to defeat former President Donald J. Trump is anything but guaranteed. History has shown that convention hype does not always translate into November success, and Trump is known for his formidable political battles.

Despite her impressive debut as a general election candidate, Harris still faces polls within the margin of error. This reality was reiterated by prominent figures like former President Bill Clinton and former first lady Michelle Obama, who cautioned Democrats to temper their expectations. Representative Hillary Scholten, a Democrat from Michigan, acknowledged the electrifying energy but emphasized the need for "Michigan grit" to secure a victory in a closely divided battleground state.

Scholten, who won her seat from a Republican incumbent in 2022, recalled how Trump surprised the world by winning Michigan in 2016 with a margin of fewer than 10,000 votes. Trump's return to the state this week underscores his determination. Senator Tammy Baldwin, a Democrat from Wisconsin, believes that the convention has generated excitement beyond the already converted, with people at home becoming increasingly engaged through media coverage.

During her acceptance speech, Harris aimed to connect with those watching at home, presenting herself as a product of a modern American blended family, a champion for justice, and a pragmatic leader who would bridge divides. This stark contrasted the Republican convention, where speakers focused on a narrow definition of "real Americans."

As the presidential election draws closer, the question remains whether Harris can maintain this sense of joy throughout the fall and convert it into victory. While joy can be a powerful force in politics, fear and loathing have traditionally played significant roles as well. The historical example of Hubert H. Humphrey serves as a cautionary tale, with his "happy warrior" persona ultimately losing to Richard M. Nixon in 1968.

Harris also faces the challenge of being a sitting vice president, held accountable for the events of the next few months in an administration led by someone else. The specter of an escalating war in the Middle East or sudden economic setbacks looms over her campaign.

However, one advantage Harris holds is her status as a non-incumbent who bypassed a challenging primary battle. This fresh face in the fall campaign flips the age argument against Trump and gives her a unique position.

As the dust settles from the convention, the spotlight now turns to Harris and her ability to sustain the energy, navigate the challenges, and secure victory in the face of a formidable opponent.