It's just a few hours until Obama supporters in Iowa head into their local caucuses.

When they do, they will know that a nationwide movement of 500,000 people across the country who have taken ownership of this campaign is behind them.

Just wanted to thank those of you in this community who have taken the leap to be a part of this. This unprecedented number shows just how strong the grassroots support is across the country and how many people are ready to take the political process back. (You can follow the live count on BarackObama.com.)

One more thing: in the spirit of Obama the organizer, we hit the goal with donors who had given before promising to match another Obama supporter's first-time donation. The two supporters get a chance to exchange messages and even share their email addresses with one another if they choose in order to continue the conversation.

Sam's been tracking some of the amazing exchanges on our blog -- take a look at a few.

Note: I'm the New Media Director for Barack Obama's presidential campaign.