The email, entitled "This is Why," says making changes will be "enormously difficult."

"To prevail, we must once more build a coast-to-coast operation ready to knock on doors, deploy volunteers, get out the facts, and show the world how real change happens in America," the email states.

Here is the text of the fundraising appeal, which was sent out by the Democratic National Committee:

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"Last year, millions of Americans came together for a great purpose.

Folks like you assembled a grassroots movement that shocked the political establishment and changed the course of our nation. When Washington insiders counted us out, we put it all on the line and changed our democracy from the bottom up. But that's not why we did it.

The pundits told us it was impossible -- that the donations working people could afford and the hours volunteers could give would never loosen the vise grip of big money and powerful special interests. We proved them wrong. But as important as that was, that's not why we did it.

Today, spiraling health care costs are pushing our families and businesses to the brink of ruin, while millions of Americans go without the care they desperately need. Fixing this broken system will be enormously difficult. But we can succeed. The chance to make fundamental change like this in people's daily lives -- that is why we did it.

The campaign to pass real health care reform in 2009 is the biggest test of our movement since the election. Once again, victory is far from certain. Our opposition will be fierce, and they have been down this road before. To prevail, we must once more build a coast-to-coast operation ready to knock on doors, deploy volunteers, get out the facts, and show the world how real change happens in America.

And just like before, I cannot do it without your support.

So I'm asking you to remember all that you gave over the last two years to get us here -- all the time, resources, and faith you invested as a down payment to earn us our place at this crossroads in history. All that you've done has led up to this -- and whether or not our country takes the next crucial step depends on what you do right now.

Please donate whatever you can afford to support the campaign for real health care reform in 2009.

It doesn't matter how much you can give, as long as you give what you can. Millions of families on the brink are counting on us to do just that. I know we can deliver.

Thank you, so much, for getting us this far. And thank you for standing up once again to take us the rest of the way.

Sincerely,

President Barack Obama"