Massachusetts Sen. Elizabeth Warren, the populist Democrat and foe of big banks, has not listed a $1.3 million credit line against her home with Bank of America on annual financial disclosure documents because of a loophole in federal law, according to a new report. The Boston Herald reported Wednesday that Warren, who is required to disclose financial assets and liabilities, avoided listing it in 2014 because it’s a line of credit — not a mortgage — and the Democrat doesn’t actually owe enough money yet. Here’s how the Democrat’s office explained the situation to the Boston Herald: “An aide for...