Jackson is seeking President Barack Obama's former U.S. Senate seat.
The pastors say Jackson is the candidate who best represents their interests.
"She has been visible in our communities and in our neighborhoods and her entire life has been indicative that she has a care and concern for our people," said Rev. Albert Tyson.
"A good pastor friend of mine once told me that any problem you are looking to solve can be found in pews on Sunday morning across the state and across the country. And as the president of the Chicago Urban League, I understood that," said Jackson.
Other Democrats running for Senate include Illinois Treasurer Alexi Giannoulias, former city of Chicago inspector general David Hoffman, and attorney Jacob Meister.