Senator Elizabeth Warren has declared herself ready to be Hillary Clinton’s running mate in the US presidential election. The Massachusetts senator – popular among the progressive wing of the Democratic party – made the declaration shortly after endorsing Clinton, calling her “a fighter with guts” who would keep Donald Trump out the White House. In an interview on MSNBC, Warren was asked by Rachel Maddow: “If you were asked to be Secretary Clinton’s running mate, do you believe you could do it?” Her response was concise: “Yes, I do.”