In this video posted on his presidential exploratory committee website, Senator Barack ObamaBarack Hussein ObamaJudge orders Walker to hold special elections Mueller investigates, Peters quits Fox, White House leaks abound 2020 Dems compete for top campaign operatives MORE's (D-Ill.) sets the stage for his announcement Saturday that he will run for president.

Obama says he is ready to begin "a journey to take our country back and fundamentally change the nature of our politics." He also calls on his supporters to help him run a different type of campaign.

"I am absolutely convinced that we can do a different kind of campaign," he says, "One that opens up the process and empowers every day voters all across the country."

He concludes the clip with a call to action.

"Let's go get to work," he says.