WASHINGTON (CNN) -- A memo from Sen. Hillary Clinton's deputy campaign manager proposing the New York Democrat pull out of the Iowa contest is giving her campaign heartburn.

A source dismisses the memo as an unsolicited idea which was floated, but solidly rejected.

The pull-out suggestion was made in response to a number of changes in the primary campaign schedule which put other big states into the forefront of the primary season -- a calendar change which forces candidates to divide up their time and finances in ways that are unprecedented in a primary season which has traditionally featured the Iowa caucuses and the New Hampshire primary as the key contests.

A Clinton spokesman says the campaign is unequivocally committed to competing in Iowa. She plans to be in the state over the next three weekends and the campaign says it has doubled the size of the Iowa field staff over the past month.

"We are committed to building an organization there," the spokesman said.

Clinton is scheduled to make at least six campaign stops this Friday and Saturday in the Hawkeye State.