Elizabeth Warren Introduces Herself to Massachusetts Voters in New Ad BOSTON - In a new television ad, Elizabeth Warren compares her climb from modest roots, to the struggles of college students today, who she says, drown in debt while "big corporations like G.E. pay nothing - zero - in taxes." The 30-second spot, released on Monday, opens with family photos from Ms. Warren's childhood when, she says, her family was "hanging on by our fingertips to a place in the middle class." Recent polling shows that voters are still getting to know Ms. Warren, a relative newcomer to the state's political scene even after her high-profile stint as a consumer advocate in the Obama administration. Her opponent, the Republican incumbent Scott P. Brown, has worked to define her as an elitist partisan, drawing on her progressive politics and position as a Harvard Law School professor. This television ad, like her first one, appears to be an effort by Ms. Warren to put her story into her own words. "Back then, America invested in kids like me; we had a lot of opportunities," Ms. Warren said. Today, Washington lets big corporations like G.E. pay nothing - zero - in taxes, while kids are left drowning in debt to get an education. Ms. Warren is highlighting the rising cost of college ahead of a scheduled increase in interest on federal student loans on July 1, which she has called on Congress to prevent, according to an e-mail sent to supporters on Monday. The Brown campaign rebuked the advertisement in an e-mail sent Monday afternoon, pointing to Ms. Warren's reported 2009 salary of $349,375 for her work as a Harvard law professor. "She should first look at factors that drive high tuition rates, such as the exorbitant salaries and compensation packages that many professors and administrators receive," the release said. Corporate taxation is a familiar theme for the Warren campaign - and one to which she appears to be returning after mounting a push in support of the Buffett Rule, a measure that would have increased taxes on individuals earning more than $1 million per year, before it died in the Senate last week. Although the race between Ms. Warren and Mr. Brown is widely expected to be one of the most expensive Senate races in history, the advertisement, which will be broadcast statewide, is only the second television ad of Ms. Warren's campaign. Mr. Brown has so far refrained from using television ads, although he makes radio ad buys called "Scott Brown Radio Reports" about once a week and has released several online video ads.