The top GOP presidential contenders are all heading to Philadelphia this week to address one of the most powerful factions of the Republican Party: parents. The summit is hosted by Moms for Liberty, which has become one of the most dynamic groups in the conservative movement since it launched two years ago. Even though Moms for Liberty doesn’t plan to endorse a candidate in the presidential race, the 2024 candidates are coming to court the group — in large part because of the outsize influence its chapters have had on the local level. Candidates endorsed by the nonprofit have swept...