WASHINGTON (AP) — As Democrats push ahead with President Joe Biden’s $3.5 trillion rebuilding plan, they’re promising historic investments across the arc of an education — from early childhood to college and beyond — in what advocates describe as the most comprehensive package of its kind in decades. The education provisions in Biden’s “Build Back Better” proposal would serve as a bedrock for schooling opportunities for countless Americans and test the nation’s willingness to expand federal programs in far-reaching ways. Equity is a focus, as it seeks to remove barriers to education that for decades have resulted in wage and learning disparities based on race and income. And by expanding…