In the first three months of 2013, Madigan raised $4.4 million, almost three times what Quinn reported on April 1.
"She is taking the steps necessary to ensure that she has the financial and political resources necessary for another campaign, whatever that may be," Gina Natale, a Madigan campaign aide, said in a statement.
Daley did not respond to requests for comment.
While the all-in-the-family field of potential candidates may seem to some like yet another Illinois political oddity, it isn't so striking to former U.S. Sen. Adlai Stevenson III, whose own Illinois family tree includes a vice president, secretary of state and a governor.
"My father used to say he was born with an incurable, hereditary case of politics," Stevenson said. "You're born into a life of service, and sometimes you're just conditioned to carry on."
Associated Press Writer Sophia Tareen contributed to this story.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.