(Bloomberg) — Vice President Kamala Harris will launch her nascent presidential campaign in earnest Tuesday with a rally in Milwaukee seeking to answer the biggest question on skittish Democrats’ minds: How does she plan to beat Donald Trump?

Harris, thrust suddenly into the fray after Joe Biden announced Sunday that he wouldn’t seek reelection, has spent the last two days clearing the field of other potential contenders. She has secured the endorsement of nearly every major Democrat, and announced a record-breaking fundraising haul of more than $100 million during her first day as a presidential candidate.