President Joe Biden's campaign is facing challenges following a series of setbacks, including a poor debate performance and concerns about his mental acuity. Fundraising efforts have been impacted, with key donors pausing outreach and questioning Biden's viability in the race. There are reports of aides contacting delegates to assess loyalty amidst fears of a floor revolt at the upcoming convention. The pause in fundraising activities could jeopardize Biden's extensive campaign operations, including over 160 offices and hundreds of staff. The situation highlights a critical juncture for Biden, with donors and delegates expressing doubts about his ability to lead effectively.