What does that mean?(f) APPLICABILITY OF CERTAIN GROUNDS OF INADMISSIBILITY.—In determining an alien’s inadmissibility under this section, section 212(a)(9)(B) of the Immigration and Nationality Act (8 U.S.C. 1182(a)(9)(B)) shall not apply.
Current law states that those applying for green cards are ineligible if they are either "illegally present" at any point or overstay the terms of their work visa. Such an immigrant, in current law, would have to return to their home country and restart the immigration process. The Corker Amendment wipes away that enforcement mechanism.
In the current draft of the Corker Amendment, any worker in the country on a legal work visa for 10 years can get a green card, even if they overstay their visa. The Corker Amendment allows immigrants to break the law in the future and still be eligible for citizenship. It absolves prospective behavior, not simply past mistakes. I doubt is Corker et al intended that the public would figure this out before the vote on Monday.