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This could be a few things, first try switching a rear tire to the front and see if that helps, you may have bent the rim but you would need to look at it and see is the rim is bent then look at the tie rod end to see if its bent, you could have bent the strut or lower control arm too. i would take a look at the tie rod end and see if its bent, here the thing, you say it wobbles and pulls, a tie rod end or strut or control arm will make the car pull but not wobble, a wobble would be caused by a bent rim or tire witth a bubble and this can make the car pull, tire putting the spare tire on and see if it still pulls and wobbles, if it doesnt then you know its the rim or tire, hope this helps.
Your cobalt should still be under warranty, so you should bring it back to the dealer. If you have done massive driving and your out of warranty, then il'd have to say that you may have a wheel bearing hub gone bad and needs to be replaced. Check the tire pressure first, tire condition and look for any signs if tire damage like tire belt separation. Tire belt separation is when the steel belt in the tires that keep the tire it's shape has broke and there is a flat spot causing the wheel shimmy. If your not sure,rotate the wheel by placing the front wheels to the rear and the rear to the front, making sure the tires are properly inflated to the recommended PSI. Good luck and start with checking the tire first.
If it sounds like a rumble from back wheels it may be the rear end going out. Mine has been replaced twice with used rear end. You should be able to confirm it by looking at the rear tires both sides of tire for an oil leak or wet spot on tire or rim.