The throngs of protesters who attended the Women’s March on Washington, and who continue to demonstrate at airports, town halls, and on city streets around the country, have made clear that opposition to Donald Trump’s radical Republican agenda will be sustained and powerful. But to earn the trust of the majority of Americans who reject Trumpism, Democrats will have to go beyond simple resistance. They’ll have to show that if voters restore them to power, they’ll actually improve the lives of working families. [...]