Former president Bill Clinton, center, speaks to an unidentified woman as Rep. Charles Rangel watches, right, at New York's Apollo Theater, Wednesday, April 24, 2002. The Democratic National Committee announced the launch of a nationwide voter registration drive, "Every Vote Counts" and held a celebrity-filled concert at the Apollo Theater to spotlight the effort. (AP Photo/Mark Lennihan)
Former U.S. president Bill Clinton (L) speaks with the Reverend Al Sharpton (R) and Rep. Anthony Weiner at a voter registration rally, part of a Democratic National Committee nationwide voter registration initiative, in New York on April 24, 2002. Later in the day Clinton will attend a DNC fundraiser at the Apollo Theater with singer Michael Jackson and other entertainers. REUTERS/Peter Morgan
Al Gore speaks about the environmental policies of the Bush administration during an Earth Day speech at Vanderbilt University in Nashville, Tenn., Monday, April 22, 2002. (AP Photo/Mark Humphrey) - Apr 22 5:46 PM ET
Former Vice President Al Gore, right, holds hands with wife Tipper, left, while waving to the crowd after Gore addressed the Florida Democratic Party State Conference 2002 on Saturday, April 13, 2002 in Lake Buena Vista, Fla. (AP Photo/Scott Audette)
Former Vice President Al Gore, right, listens to his mother Pauline Gore, left, on Saturday, Feb. 2, 2002 before a Tennessee Democratic Party fund-raiser in Nashville, Tenn. Gore said, during a speech in front of the group, he intends to rejoin the national political debate, criticizing President Bush's handling of the economy. (AP Photo/Christopher Berkey)