Biden has attempted to demonstrate his competency, hoping that voters can visualize him as a president responding to a crisis. Whether Biden can continue that outreach while facing criticism from Sanders on the debate stage Sunday is a key question. Sanders speaks to reporters on Wednesday, March 11, 2020, in Burlington, Vt.How aggressive Sanders is with Biden could preview how long this primary battle will last. But how Sanders approaches Biden Sunday will set the tone for to the rest of the primary. But Biden's team, after watching Sanders' speech on Wednesday, is hopeful that won't be the case four years later.

Source: CNN March 15, 2020 09:56 UTC