SPRINGFIELD, Ill. - Democratic Sen. Barack Obama (news, bio, voting record) plans to stand outside Illinois’ Old State Capitol on Saturday, a building indelibly linked to Abraham Lincoln, and tell the world about his 2008 presidential plans.

In a video preview announcement on his presidential exploratory committee’s Web site, Obama said he’s humbled by the enormity of the task ahead and urged supporters to get involved. “Tomorrow, we begin a great journey. A journey to take our country back and fundamentally change the nature of our politics,” Obama said.

For Obama, it will be the start of a long weekend of rallies and events that will take him from Springfield to Iowa and then on to Chicago before he wraps up Monday in New Hampshire.

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