Virginia Governor Abigail Spanberger has signed legislation joining the National Popular Vote Interstate Compact (an agreement under which member states pledge to award their presidential electors to the winner of the national popular vote, regardless of the outcome within each state), bringing the total to 18 states and the District of Columbia. The compact will only take effect once member states collectively represent 270 of the 538 electoral votes needed to win the presidency; Virginia's addition brings the total to 222. All current member states lean Democratic, but advocates note that legislation is pending in several swing states including Arizona, Pennsylvania and Michigan, which could push the coalition past the required threshold.