Nearly 4,000 progressive activists gathered at Netroots Nation in Philadelphia last week.<br />They met to strategize and hear from some of the most outspoken Democrats on the party's left flank.<br />Business Insider said attendees at Netroots overwhelmingly aligned with the more progressive wing of the party.<br />But some remain undecided about their 2020 primary vote.<br />"I'm here for Kamala Harris or Elizabeth Warren," Chris Petzold, a Washington state Indivisible chapter founder, told INSIDER. <br />
