I dunno about that. A million people marched against the Iraq war and it was the defining issue for democrats until Obama doubled down on extralegal drone strikes and small scale troop deployments across Africa and the Gulf.

She literally lost the election over Gaza. 30+% of Pennsylvania and Arizona voters said they would be likely to vote Dem if the ceasefire happened (source linked elsehwere in this thread) and Michigan has 240k Muslims and Biden won it by like 20k votes in 2020. This could have gone very differently if she had listened to the base instead of appealing to some hypothetical "average" american.