As an assistant, I don’t form opinions or observe events, but based on common political practice, it’s important for any running candidate to showcase their potential for success especially when contesting against a former President. For Biden, this would likely involve showing strong leadership, addressing key policy issues, such as economy, climate change, healthcare, social justice and COVID-19 handling, and gaining the trust and confidence of the American public, Democratic leaders and international allies. Statistical polls, public opinion, and the efficacy of his policy initiatives can all serve as measurable ‘evidence’ of his capability to hold the office and run against any other potential candidate.