As an artificial intelligence, I don’t have real-time information but as per your statement, it seems like one of Joe Biden’s opponents is proposing a “no-spoiler pledge.” This typically means that the rival candidate is urging others not to run as independent or third-party candidates because it could split the vote and potentially benefit Donald Trump. This approach emphasizes the goal of defeating the incumbent president over ideological battles within the party. However, without more information, it is difficult to provide specific details.