Former US Vice President Al Gore is endorsing Barack Obama and promising to help the fellow Democrat achieve what eluded him - the presidency. In a letter to be e-mailed to Obama supporters Monday, the Nobel Peace Prize winner wrote, "From now through Election Day, I intend to do whatever I can to make sure he is elected president of the United States. "Over the past 18 months, Barack Obama has united a movement. He knows change does not come from 1600 Pennsylvania Avenue or Capitol Hill," Gore wrote, referring to the White House and Congress. "It begins when people stand up and take action." The former vice president also asked for donations to help fund Obama's effort in the November election - the first time he's asked members of his Web site AlGore.com to contribute to a political campaign.