Leading the event at a union hall in Moline was Illinois US Senator Tammy Duckworth, running for a second term against Republican Kathy Salvi.
And as much as she wants to win, Duckworth says it's critical for all the Democrats on the ballot to be elected - from governor on down to sheriff and county board.
"But I got to tell you I need partners. I need partners in Springfield, I need partners in the House, and that is where each and everyone of you working as hard as you do is going to help give me those partners. So that we can be that shining spot of blue on the map that we are here in Illinois."
Duckworth worries if Republicans take control of Congress, they'll try to end
Social Security and Medicare, cancel the Affordable Care Act, and remove upcoming caps on insulin and annual drug costs.
Also worried about the future of Social Security is retiring 17th District Congresswoman Cheri Bustos.
"I hate the word entitlement. It's not an entitlement, it's what they paid into and it's what we've set up to make sure it's the most sound security net, safety net, in the history of our nation. Those are the kind of things that are at risk if we don't do everything we can between now and 7 pm tomorrow."
Governor Pritzker and other statewide candidates were scheduled to attend the Quad Cities rally, but travel problems kept them away. Earlier Monday, similar rallies were held in Springfield and Peoria, followed by one that night in Rockford.