Warren now faces questions about her law licenses, legal defense of big biz Democratic Senate candidate Elizabeth Warren lists the address for her legal practice as Massachusetts but no records show her having a license to practice law in the state, according to an Ivy League law professor. Cornell law professor William Jacobsen says he found no law license under Warren's last name or her maiden name, Herring, during an exhaustive search of state records. Jacobsen said he also confirmed with a clerk at the Massachusetts Board of Bar Overseers that Warren has never even applied for a license. In addition, Jacobsen said he could find no record of Warren getting a permit to practice law at the address - her law professor office at Harvard in Cambridge, Mass., he wrote Monday in his blog legalinsurrection.com. Jacobson also posted several legal documents that included the Harvard address. Issues about Warren's legal practices began surfacing last week in her first debate with GOP Sen. Scott Brown - another attack in what has been a hard-hitting, razor-close race from the start. An averaging of polls by the RealClearPolitics website has Warren leading by less than 2 percentage points. Brown -- who on Thursday repeatedly referred to Warren as "professor" during the candidates" first debate -- reminded viewers that Warren in 2009 represented Travelers Insurance Co. before the Supreme Court in an asbestos-related case. Warren was paid $212,000 for three years of work in a case that involved thousands of asbestos victims and was "notable because Warren, who has gained fame for defending consumers against big business, was in this case working on behalf of a big business," The Boston Globe wrote. In addition, Warren in 1995, as a Harvard Law professor, attempted to help the LTV steel conglomerate avoid paying $140 million in benefits to retired coal miners, The Boston Herald reported Tuesday. Warren wrote a petition to the Supreme Court challenging a lower court ruling for the miners. The high court never took up the case, but Warren was paid roughly $10,000, according to documents obtained by the newspaper. The Warren campaign had not responded to requests to verify whether the candidate has a license in Massachusetts or elsewhere. Jacobsen writes that Warren listed in a 2008 resume that she has a license to practice law in Texas and New Jersey. Texas records show the license is inactive, but doesn't indicate when. And Warren unexplainable on Sept. 11 cancelled her New Jersey license, making it unclear if or where she was licensed during the Travelers case. The questions about Warren's legal licenses follow repeated ones about whether she falsely or exaggeratedly used her Native American ancestry to get law professor jobs at Harvard and the University of Pennsylvania. A genealogist says his research shows Warren is 1-32nd Native American Indian. Brown posted an ad Monday that revisits and repeated questions about whether Warren used the Native American Indian status for professional gain. On Tuesday, Warren released a new, 30-second ad against the attacks. "I never asked for and never got any benefit because of my heritage," Warren says in the ad. The people who hired me said they didn't even know about it. Scott Brown can keep attacking my family, but I'm going to keep fighting for yours.