By LISA MASCARO, ZEKE MILLER, MICHAEL BALSAMO and AAMER MADHANI WASHINGTON — Critical days ahead, President Joe Biden is facing the stark reality that many Democrats at the highest levels want him to consider how stepping aside from the 2024 election to make way for a new nominee atop the ticket could be the party’s best chance of preventing widespread losses in November. Isolated as he battles a COVID infection at his beach house in Delaware, Biden’s already small circle of confidants before his debate fumbling has downsized further.