Vice President Joe Biden will appear this week for the first time before the largest gathering of progressive activists in the country, a critical constituency for any Democrat with presidential ambitions.
Biden’s debut at the annual Netroots Nation comes as the vice president has made a number of moves that could better position himself with the liberal wing of the Democratic Party, if he decides to make a third run for the presidency.
Those moves could help him compete for liberal support with Sen. Elizabeth Warren of Massachusetts if she runs for the Democratic nomination, and stake out the left flank of Hillary Clinton. . .