WASHINGTON (CNN) -- DraftObama.org, a grassroots movement urging Sen. Barack Obama to run for president, launched an Iowa-based group Tuesday to reflect support from independent voters for the Illinois Democrat's potential presidential run.

The new group -- called "Independents for Obama" -- "comes in response to growing calls on the group's Web site to acknowledge the significant support of non-party affiliated voters for a presidential run by Senator Obama," according to a statement.

"We felt it important to recognize the growing presence within our camp of independent voters," said Ben Stanfield, founder of DraftObama.org. "Like many of us, these voters -- who represent up to a third of the electorate -- are drawn to Senator Obama's pursuit of a truly American Agenda and a rejection of the politics of division and rancor."

Obama, who was expected to decide on a presidential run during his vacation in Hawaii last week, has said he will announce his plans soon.