Major challenger to Kamala for Democratic nomination?

This market will resolve to “Yes” if any major candidate announces they are challenging Kamala Harris for the Democratic nomination for President of the United States between July 22, 2024, and the moment the Democratic nominee is announced. A major candidate is defined as any current or former Senator, Governor, House member (congressman), Cabinet member, or former President/First Lady. Otherwise, this market will resolve to "No." This market will resolve to "No" if Kamala Harris officially wins the Democratic Nomination before a major challenger has announced. If Kamala Harris drops out before a candidate has announced a challenge this market will resolve to "No". The resolution source will be a consensus of credible reporting.