I voted for Johnson. Kirk is clearly vulnerable, but he has an amazing ability to win tough races, so I'm not counting him out. He's also very personable (I've met him in person) which certainly helps on the campaign trail.
That was more due to his incredible luck in drawing incompetent or deeply flawed opponents than his campaign skills.
Of course the jury is still out for Duckworth too when it comes to how formidable a candidate she is.
You don't go to the Northwest and Northern suburbs to find non-Jewish liberals en masse; Democrats shouldn't have as easy of a time the last two cycles as she did with that district, which voted for GWB twice and elected Henry Hyde time after time.
Meh, the Schaumburg/Palatine/Arlington Heights suburban sprawl area is pretty in-the-middle and is, if anything, drifting very much toward the Dems as the GOP is percieved to be going right-ward.
Not a liberal area necessarily, but no longer a Republican stronghold.