A waiver of grounds of inadmissibility allows U.S. entry to anyone who would otherwise not be allowed to enter. Being inadmissible prevents you from entering the U.S. at all, even if you have a sponsor. With form I-601, you can apply for a waiver to USCIS.
To work towards the best application, meet with an immigration attorney. You will need to make a good case that proves you deserve the waiver. An immigration attorney can help you work towards getting the results you want.