Elizabeth Warren has a plan for everything. Some of those plans are expensive. With Warren emerging as a front-runner in the Democratic presidential contest, Yahoo Finance tallied the cost of her plans. Altogether, the Massachusetts senator’s agenda would require $4.2 trillion per year in new federal spending, and a like amount in new taxes, if she paid for everything without issuing new debt. The federal government currently spends about $4.4 trillion per year, so Warren’s plans would nearly double federal spending. The Treasury takes in about $3.4 trillion in tax revenue each year, so if Warren levied new taxes to...