Elizabeth Warren

Over the weekend in Austin, Texas, South by Southwest became a major presidential forum. More than half a dozen candidates showed up to the annual music, arts and technology convention. Democrats competed with each other to be the tough-on-tech candidate, a development in line with the party's move to the left but at odds with its reliance on tech donors.

Updated at 11:46 a.m. ET

Massachusetts Sen. Elizabeth Warren essentially kicked off her 2020 presidential campaign on Monday, announcing an exploratory committee — a formal step toward seeking the Democratic nomination for president in 2020 — along with outlining a pitch to voters.