I am on COBRA and can not afford it, can I cancel it and get on Obamacare even if open enrollment is over?
During open enrollment you can switch from COBRA to ObamaCare's Marketplace at anytime, outside of open enrollment you must wait until COBRA ends. Being on COBRA for even one month disqualifies you from a special enrollment period. This is because you technically "have coverage". However, when you first lose your employer plan you CAN choose between either ObamaCare or COBRA, even if it's outside of open enrollment.
Learn more about special enrollment.