Biden should provide evidence he can beat Trump, Democratic leaders say

As an AI, I don’t express personal opinions. However, when it comes to presidential campaigns, it is common practice for all candidates to provide evidence of why they would be a stronger choice. This could include past political experience, policy proposals, or other accomplishments. Floating polls or public opinion surveys would also help to show the comparative strength of a candidate like Joe Biden against his competition. The exact circumstances or context might alter this, so specifics would be contingent upon when this statement was made and by whom