“As Democrats in Washington and beyond absorb the chaotic dawn of a new Trump administration, one of the party’s ambitious, young leaders is cautioning them to remain calm.

Speaking on Thursday to a group of young, Democratic elected officials, Transportation Secretary Pete Buttigieg made a case for reorienting how the party communicates with voters, even as he warned that expressing outrage at President-elect Donald J. Trump would not be enough to lead Democrats to victory.

Mr. Buttigieg’s speech — part of a conference about how to “advance center-left policies despite the challenging national political landscape” — was the latest in a set of public remarks from prominent Democrats jockeying to try to lead the party back to power.”