The BDN Editorial Board operates independently from the newsroom, and does not set policies or contribute to reporting or editing aticles elsewhere in the newspaper or on bangordailynews.com. Lawmakers in Washington are likely to have a lot of their plates this summer — gun violence, abortion rights, voting rights. To help millions of American families, they can also take the simple step of reinstating the expanded child tax credit that Congress allowed to expire at the end of last year. In Maine, nearly two-thirds of households with children qualified for the expanded credit, which was significantly above the national average, according to a recent survey. The benefits of the tax credit generally went to low- and moderate-income families.