Former Vice President Al Gore announced his support for Barack Obama in a letter sent to supporters this afternoon.
The 2000 Democratic nominee, who did not endorse a candidate during the primary season, will join Obama at a rally in Detroit tonight.
In Gore's letter, he urges his supporters to make a contribution to the Obama campaign.
"I've never asked members of AlGore.com to contribute to a political campaign before," Gore writes. "But this moment and this election are too important to let pass without taking action."
Read Gore's letter below:
A few hours from now I will step on stage in Detroit, Michigan to announce my support for Senator Barack Obama. 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 next four years, we are going to face many difficult challenges -- including bringing our troops home from Iraq, fixing our economy, and solving the climate crisis. Barack Obama is clearly the candidate best able to solve these problems and bring change to America.
I've never asked members of AlGore.com to contribute to a political campaign before, but this moment and this election are too important to let pass without taking action.
That's why I am asking you to join me today in showing your support for Barack Obama by making a contribution to his campaign today:
Over the past 18 months, Barack Obama has united a movement. He knows change does not come from 1600 Pennsylvania Avenue or Capitol Hill. It begins when people stand up and take action.
With the help of millions of supporters like you, Barack Obama will bring the change we so desperately need in order to solve our country's most pressing problems.
If you've already contributed to Barack Obama's campaign, I ask that you consider making another contribution. If you haven't, please join the movement right now:
On the issues that matter most, Barack Obama is clearly the right choice to lead our nation.
We have a lot of work to do in the next few months to elect Barack Obama president and it begins by making a contribution to his campaign today.
Thank you for everything you do,
LIVE TONIGHT -- 8:30 p.m. EDT: Watch streaming video of Al Gore and Barack Obama at a rally in Detroit, Michigan: