(Bloomberg) -- National Democrats typically close ranks behind the party’s incumbents, but Elizabeth Warren is breaking with that practice.
On Monday, the presidential candidate endorsed Jessica Cisneros, the liberal primary challenger to Representative Henry Cuellar of Texas, who has served since 2005.
Cuellar is among the more conservative members of the Democratic caucus, voting in alignment with President Donald Trump’s position more often than all but a few of his party colleagues, according to FiveThirtyEight.
The Cisneros campaign mocked Cuellar as “Trump’s favorite Democrat.” Cuellar’s district backed Hillary Clinton by 20 points in the 2016 election.
Warren also endorsed Marie Newman, who is mounting a primary challenge against Representative Dan Lipinski, one of the few anti-abortion Democrats in Congress.