In an op-ed published Friday, Iowa state co-chair of the Nikki Haley for President campaign, Dawn Roberts, endorsed the vice president in this year's election.

Gov. Gretchen Whitmer is expected to attend as well. Other Harris supporters from around the country from groups like Mamas for Kamala, White Dudes for Harris, and Progressives for Harris, will appear virtually.

Vice President Kamala Harris joined host Oprah Winfrey at a star-studded campaign event in Farmington Hills, Michigan, on Thursday, which was live-streamed across multiple platforms. Why it matters: Harris campaign advisers see the "Unite for America" event that's aimed at getting people to register to vote as a huge opportunity to reach a broad cross-section of persuadable voters.