Again, the key is going to be suburbia around Cooke County. If Kirk can sweep these votes, which we used to win, but not lately and keep the margin in Cooke to somewhere around 60-40, there's a chance.
A Republican can't come close to winning 40% in Cook County.
Cook County is entirely in IL-1,IL-2,IL-3,IL-4,IL-5,IL-7,and IL-9.
A Generic Democrat- gets over 80% of the popular vote in IL-1,IL-2,IL-4,and IL-7.
A Generic Democrat gets over 70% of the popular vote in IL-5 and IL-9.
A Generic Democrat gets over 60% of the popular vote in IL-3.
A portion of Cook County is in IL-6,IL-8,IL-10,and IL-13.
Peter Roskam's base is DuPage County.
Melissa Bean overperforms in McHenry and Lake County.
Mark Kirk's base is Lake County
Judy Biggerts base is DuPage and Will County.
A Generic Democrat will get at least 70% of the popular vote in Cook County which consists of 40% of the electorate. For a Democrat to lose in Statewide- they need to get less than 40% in Downstate IL and Collar Counties. Carol Moseley Braun lost every County outside of Cook County.