Democratic presidential hopeful Elizabeth Warren said breaking up giant tech companies would \u201ckeep the marketplace competitive,\u201d during an appearance at one of the biggest technology events in the U.S. The Massachusetts senator spoke Saturday at the annual South by Southwest cultural festival in Austin, Texas, a day after proposing to take steps to break up companies like Facebook Inc. and Alphabet Co.\u2019s Google if she\u2019s elected. On Friday she called for legislation that would designate large technology companies as \u201cplatform utilities,\u201d and for the appointment of regulators who\u2019d unwind technology mergers that undermine competition and harm innovation and small businesses. \u201cThe idea behind this is for the people in this room,\u201d for tech entrepreneurs who want to try out \u201cthat new idea,\u201d Warren told a packed and enthusiastic crowd. \u201cWe want to keep that marketplace competitive and not let a giant who has an incredible competitive advantage snuff that out.\u201d Warren said venture capital \u201cin this area\u201d has dropped by about 20 percent because of a perceived uneven playing field. She didn\u2019t provide more detail or say where she obtained her figures. Trust-Busting Teddy Warren outlined her plan in a Medium post on Friday, saying the very success of companies like Amazon and Google \u201chighlights why the government must break up monopolies and promote competitive markets.\u201d Referring to previous eras of U.S. monopoly bust-ups, Warren, 69, said that what\u2019s new is old: when someone gets excessive market dominance, they start to destroy the market competition. In fact, she named Republican Theodore Roosevelt as her favorite president, adding, \u201cCome on, the trust buster!\u201d Senator Amy Klobuchar, who announced her 2020 bid last month, spoke in Austin earlier on Saturday. The Minnesota lawmaker is the top Democrat on the Senate\u2019s antitrust panel. She stopped short of endorsing a breakup of large technology companies. \u2018Cool\u2019 Antitrust Asked if the likes of Google, Facebook or Amazon.com Inc. should be split, Klobuchar said she would first want an investigation. While vowing to make antitrust \u201ccool again,\u201d she suggested a more measured approach. \u201cWe are going to be able to have a better discussion of this framed in a way around things like pharma pricing and data privacy, which is going to make it more bite sized and doable for an election,\u201d Klobuchar said. SXSW, as the festival is known, is the biggest gathering so far for the Democrats - and a few Republicans - running in 2020 or otherwise part of the political scene. The conference has evolved into one of the country\u2019s defining cultural events, combining music and film festivals with showcases for technology and politics. This year, it\u2019s an ideal venue for presidential aspirants to test their message with one of their core audiences: millennials and post-millennials. Youth Vote Nikhil Patel and Ana Boyer showed up at Austin City Limits Live theater two hours early to get in line for Klobuchar. Patel, 21, graduated from University of California Berkeley in December with a computer science degree, and has a job lined up at Google. He\u2019s following the presidential candidates closely and read Warren\u2019s proposal with interest. When it comes to her concerns that tech companies have become too powerful, \u201cI don\u2019t necessarily disagree,\u201d he said, sitting on a concrete curb outside the theater. \u201cTech companies are wielding pretty disproportionate power.\u2019\u2019 Still, labeling the companies as utilities - like electric companies - and approaching oversight from that angle would be \u201cexcessive,\u201d he said. Boyer, a senior psychology major at Washington University in St. Louis, said breaking up the companies isn\u2019t too far-fetched. \u201cThe issue I have with the large tech companies is how much information they have about people,\u201d she said. She\u2019s concerned about the companies expanding into the health-care space \u201cand how much control they would have over health-care data about people.\u201d Boyer\u2019s not convinced politicians will get it right, though. \u201cA lot of young people feel like politicians don\u2019t really understand the tech industry,\u201d she said.