July 16, 2021, 10:30 a.m. ET WASHINGTON — What was once considered a progressive dream for the nation’s education system could be headed toward reality as Democrats push forward to broker a deal on a new spending plan containing President Biden’s most ambitious domestic policy goals. Included in the list of programs Democrats agreed this week to include in their $3.5 trillion budget blueprint are Mr. Biden’s campaign proposals to offer prekindergarten enrollment for every 3- and 4-year-old in the country, and tuition-free community college to every young adult. So far, both proposals are drawing widespread support from the Democratic coalition and are expected to remain priorities as the party’s top leaders seek to deliver on bedrocks of Mr. Biden’s $4 trillion economic plan.