Throughout the summer, the Progressive Change Institute, a prominent grassroots organization aligned with Democrats, teamed up with the White House to promote President Joe Biden’s domestic agenda. The group helped organize events across the country, including in battleground states such as Pennsylvania and Michigan, to publicize one of the president’s most popular proposals: a crackdown on unnecessary or hidden consumer charges popularly known as “junk fees.” The institute was encouraged by how much positive local-media coverage the events generated, taking it as a sign that a concerted campaign could lift the president’s lackluster approval ratings ahead of his reelection bid. Its leaders were eying a second round of activity this fall to amplify Biden’s record on lowering prescription-drug and child-care costs. Since October 7, however, those plans are on hold. Many progressives are protesting the administration’s support for Israel’s military offensive in Gaza, which began after Hamas’s massacre of more than 1,200 Israelis and has left more than 16,000 dead, according to Gaza’s Hamas-controlled health ministry. On perhaps no other issue is the gap between …