Vermont Sen. Bernie Sanders has netted his first endorsement from a member of Congress in his effort to best former Secretary of State Hillary Clinton and win the Democratic nomination for president.

Arizona Rep. Raul Grijalva plans to back his fellow liberal for the nomination. Grijalva spokesman Dan Lindner says the Democrat will formally endorse Sanders at an event in Tucson later this week.

Grijalva and Sanders are both members of the Congressional Progressive Caucus and share many of the same ideological views. Both believe the economy is stacked in favor of the wealthy and income inequality has left the middle class behind.

Clinton has gathered endorsements from scores of members of Congress, but Sanders has nonetheless remained in the hunt.

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