As Governor, he oversaw four executions: one by electric chair and three by lethal injection. Later, Clinton was the first president to pardon a death-row inmate since the federal death penalty was reinstated in 1988. In 1987, the media speculated that Clinton would enter the presidential race after incumbent New York governor Mario Cuomo declined to run and Democratic front-runner Gary Hart withdrew owing to revelations of multiple marital infidelities. Clinton decided to remain as Arkansas governor (following consideration for the potential candidacy of Hillary Rodham Clinton for governor, initially favored—but ultimately vetoed—by the First Lady). For the nomination, Clinton endorsed Massachusetts governor Michael Dukakis. He gave the nationally televised opening night address at the 1988 Democratic National Convention, but his speech, which was 33 minutes long and twice the length it was expected to be, was criticized for being too long and poorly delivered. Clinton presented himself both as a moderate and as a member of the New Democrat wing of the Democratic Party, and he headed the moderate Democratic Leadership Council in 1990 and 1991. During his presidency, Clinton advocated for a wide variety of legislation and programs, most of which were enacted into law or implemented by the executive branch. His policies, particularly the North American Free Trade Agreement and welfare reform, have been attributed to a centrist Third Way philosophy of governance. His policy of fiscal conservatism helped to reduce deficits on budgetary matters. Clinton presided over the longest period of peacetime economic expansion in American history. The Congressional Budget Office reported budget surpluses of $69 billion in 1998, $126 billion in 1999, and $236 billion in 2000, during the last three years of Clinton's presidency. Over the years of the recorded surplus, the gross national debt rose each year. At the end of the fiscal year (September 30) for each of the years a surplus was recorded, The U.S. treasury reported a gross debt of $5.413 trillion in 1997, $5.526 trillion in 1998, $5.656 trillion in 1999, and $5.674 trillion in 2000. Over the same period, the Office of Management and Budget reported an end of year (December 31) gross debt of $5.369 trillion in 1997, $5.478 trillion in 1998, $5.606 in 1999, and $5.629 trillion in 2000. At the end of his presidency, the Clintons moved to Chappaqua, New York, in order to satisfy a residency requirement for his wife to win election as a U.S. Senator from New York.