It really, truly sucks that the Democrats are the only viable non-Republican party, because as an organization they're staggeringly incompetent. "At least we're not the GOP" is not enough anymore, and if they're going to rip one of their own to shreds over a comment they didn't even understand, then they're no good to any of us.
It's a big tent party with many factions and not held in line by racial or religious connection. It's never going to be lockstep 100% of the time.
The goal of removing Muslims from
Congress or at least silencing them on Israel is an implicit goal of AIPAC, this shouldn't be surprising.