All three cite his willingness to work with both Republicans and Democrats.
The Pantagraph touts the longtime Naval Reserve intelligence officer's military experience. The newspaper says Kirk's admitted embellishment of his military record is "troubling" but that he's taken responsibility.
The Southtown Star endorsement includes praise for Kirk's foreign policy perspective.
The Belleville News Democrat says Kirk will work to rein in government spending and eliminate waste.
Giannoulias has picked up the endorsement of the St. Louis Post Dispatch.
(The Associated Press contributed to this report.)