Nearly 50 million Americans now are in poverty. One in four children will grow up in impoverished households. Redressing poverty is a national emergency and a moral imperative. In our money-drenched political debate, the poor receive little attention. Yet they could be the key swing vote in this election. Mitt Romney invoked the poor as part of his attack on Barack Obama’s policies. But his own agenda features devastating cuts in basic support for the poor — Medicaid, food stamps, Head Start, aid to poor schools, public housing, training — to help pay for another round of corporate and personal …