California Democrats are mobilizing fervently in support of Kamala Harris as she faces a closely contested election against Donald Trump. The Democratic Party office in Santa Monica buzzes with enthusiasm as volunteers work tirelessly to engage voters through postcards, door-to-door canvassing, and phone banking.

• Harris or Trump? These Californian Democrats are "Ready for Victory" - REPORT

• United States - A deep voice echoes through the ears of visitors as they enter the local venue. It's the voice of Barack Obama. The former president, a star within the Democratic Party, is holding a rally in Atlanta to support Kamala Harris. His enthusiastic speech of the day is being broadcast in the small Democratic Party office located on the bustling street of Santa Monica, a quaint seaside town near Los Angeles, California.

• If Trump and Harris are tied in the American presidential election, what will happen?

• The office opened on September 1st to welcome supporters of the Democratic presidential candidate. Upon entering, one is surrounded by a sea of kitsch dedicated to the vice president: colorful Kamala badges, sequin Kamala t-shirts, Kamala posters, Kamala caps... The tables are adorned with various Kamala-themed gadgets. A life-size silhouette of the candidate stands tall in the crowded room.

• In the midst of this bustling space stands Jane, the venue's manager. She stands out with her head-to-toe attire bearing the candidate's image. "The first campaign I actively participated in was Obama in 2008. Before, I was busy raising my kids. Since then, I've been involved in politics," she shares. Over the years, Jane has become a prominent figure in the Democratic Party in the Los Angeles region. "Our job is to ensure people go out and vote"

• We follow Jane behind the partitions, where Barack Obama's voice continues to resound. Amidst desks and computers, focused volunteers write on small cards. "We write cards to send to voters, urging them to vote for Democratic candidates in Congress. We also tell them to vote blue, which means for Kamala Harris," explain Shelley and Tching, two dedicated activists.

• "For the election, what matters is the turnout rate and the key states or districts. Our job is to ensure people go out and vote. We encourage them to do so early [voting is available in some states] because you never know - you might get a flat tire on election day!" Jane quips. The activists primarily target registered Democratic voters and undecided individuals, who could make a significant impact in this closely contested election.

• A few hundred votes could swing "purple" districts (neither Democratic blue nor Republican red). In California, however, there is no suspense in the presidential election. This state, where Kamala Harris was raised, has been a Democratic stronghold for decades and will continue to be so on November 5th. Democrats remain confident even with "nothing set in stone"

• Postcards are not the only tool used to mobilize voters. Activists are engaged in door-to-door canvassing, sometimes reaching neighboring states like Nevada or Arizona, as well as "phone banking." Small yellow bells are placed near the computers. Every time an electorate is persuaded over the phone and pledges to vote blue, the bell is rung loudly.

• When HuffPost meets with Jane, the election is just a few days away, and the atmosphere in the headquarters is very upbeat. No signs of worry. Smiles adorn every face. "Harris has connected with the people, her candidacy has sparked enthusiasm, she shines, she inspires positivity," she asserts. Joe Biden was nudged out in late July, weakened after his disastrous debate with Donald Trump at the end of June. "She is the right person, for the right position, at the right time," she emphasizes. "I would have supported Joe Biden and worked equally hard for him, but it's easier to rally behind her. It's easier to win."

• Does she already see Kamala Harris in the White House? "Yes, absolutely," she answers without a shadow of a doubt. Then she tempers: "But it's not a done deal, we mustn't repeat 2016 with Hillary Clinton. I believe the Democratic Party has learned its lesson. We work hard, and we'll continue to work hard until the end, as victory is not guaranteed. Especially because we need to win decisively to avoid any challenges from Trump." The latter has indicated he would accept the results if the election is deemed "fair and free." In other words, if it allows him to return to the White House. "People no longer want Trump"

• Jane's assurance may seem like denial. When reminded of the very indecisive polls, she brushes it off: "It's not that tight. We must be cautious about opinion surveys." Nationally, Kamala Harris leads by a narrow margin. In the critical swing states that will determine the election, estimates are too close, in most cases, to predict the front-runner.

• At that moment, Sahar enters the room. Like Jane, the young lawyer from Sudan is certain that Kamala Harris will take over the Oval Office after Joe Biden. "I am very optimistic because it's evident. Even Trump's former vice president and his former chief of staff have abandoned him," she points out. Mike Pence has indicated he will not vote for Donald Trump, and John Kelly labeled the Republican as a "fascist" in the press.

• "She will win because people don't want Trump, and she is the best alternative with her values. Americans know what Trump is up to, his legal issues, the corruption," Sahar believes, coming to the headquarters daily for at least an hour to engage in phone banking. "Kamala Harris reminds me of Barack Obama; there is the same energy in her campaign. That's why I feel she will win. If she doesn't win, I might end up in the hospital!" she jokes before heading to her post. "I'm very confident"

• Meanwhile, Shelley and Tching continue to write away on paper. The shy Tching adds a little sun to her cards, a sign of her optimism. Shelley boasts, "In total, we have already written 70,000 cards!" They were about twenty the previous day writing letters, as evidenced by the photos Tching proudly shows on her phone with a big smile.

• Like Sahar and Jane, the two retirees have no doubts about November 5th. "I'm very confident. Some people I know have already bought their tickets and reserved their hotels to attend the inauguration in Washington in January. We are ready for her victory," exclaims Shelley.

• "Ding, ding, ding, ding!" Suddenly, the loud bell rings. A volunteer has successfully persuaded a voter over the phone, and cheers fill the room. All Democrats hope that this new small victory will tip the election result in favor of their champion.