Obama won in his 2004 senate race with a lot of those close dark red state counties coming close to turning a close blue form him... and the close red to blue counties where his BTW.
That is where he really blew the completion out of the water. I think he got like 70% of the vote but don't quote me.
EDIT I looked it up and it was at least 70%
Obama's 43% margin of victory was the largest in the state history of U.S. Senate elections
He ran a remarkable state wide senate race against at stooge which helped immensely. But the guy visited every single 102 counties in the state at that time.
I was there at the Old State Capital building, with all the pomp and circumstance what not with the red sandstone pillars that Lincoln once served in, in Springfield when he announced for running for the POTUS. Damn ass cold February that sunny day, it was likely 10 degrees and his children were really just children than, but I was there and I gave him my full support and all I could financially. I give Senator Durban a lot of credit for encouraging him to go for it. BTW not that it matters but I got married and took photos at the same spot on a warmer day in June. I produced two fine young children, now in HS. But ... Enough said about that for now.
Not to get into the nitty gritty but The democrat would have still won if the elector was voted in by only one county. Cook. But Lake and DuPage not even made it close.
That's all that's needed. Its nice to have U of I Champaign voting to win, and the quad cities and metro east St. Louis out there but there are enough votes in one county to swarm the rest of the 101 out of 102 counties to win a nice margin.
Not that that is something proud about but its the truth.
While it was nice Illinois didn't need Carbondale's county to put it over the top. Illinois was won by many more millions voting in Cook county and it probably pisses off 99 out of 102 counties but that's the reality of it all.
Its just how the population of the state votes and lives in.
But the Chicagoland collar counties can elect a republican governor ala Rauner if push comes to shove. Cook does what it does but the collar counties will chose a republican or democrat when it comes to a state wide office like the governorship.
There just not enough votes down state to win a general election for governor without the collar counties and that's how we got a republican governor not that I am complaining just explaining how votes are tallied in Illinois.
Funny thing When Obama ran for the senate and won the POTUS he got almost 40% of the counties in the primary against her and he won almost just as large in the general. This state was his primary landslide to prevent against a California landslide that already voted via mail months prior and prevented any win HRC could claim on supper duper Tuesday back in 2008.
BHO got more democratic primary electors out of Illinois in a push than HRC got out of California in the combination of both of them. BHO could not have been the POTUS without Illinois's massive win total for him. If he ran from Nebraska, or Iowa he would have been toast that week.
Just think about that for a moment and let that sink in for a bit.
Obama went all the way down to Cairo and every little burg in the process to win when he ran for the senate. He never put all of his eggs in Cook county alone. That's why he won this states votes thrice buy going down state and talking to the people. In the 2008 Primary he didn't even need to show his face he was already very popular. He spent his better time and efforts in the caucus states and other large states sans cali before the big day. Obama came out on top because he already put his dues in Illinois. The favorite son was remarkably helpful to him that very important day.
He was a very smart Illinois politician that did not need to do what he did but he wrapped it up so good in our state he became so strong within state to let it go unchallenged in super-duper Tuesday and still run away with it in 2008.
Illinois saved him that pivotal week and he spent pretty much nothing in media coverage before hand when I remember HRC poured millions in media in the state for no gain.
That week sent him to the POTUS. One of our greatest.