“It’s kind of all consuming right now within the progressive community,” said California Representative Jared Huffman, a progressive Democrat particularly active on climate change who has made qualified calls for a cease-fire. “Just the angst of it all. ... There’s a strain [on relationships] for sure. That’s not something anybody really wants to talk about.” But the focus on the conflict is also having ripple effects behind the scenes of the far left, making it difficult for other progressive issues to break through or coalitions to organize, and straining relationships among lawmakers on Capitol Hill. WASHINGTON — The anger among...