Rep. Raúl Grijalva (D-Ariz.) threw his support behind fellow Rep. Martin Heinrich in the race to succeed retiring Sen. Jeff Bingaman (D-N.M.).

Heinrich is up against state Auditor Hector Balderas in the Democratic primary. With an eye toward two important factions of the primary electorate, the Heinrich campaign highlighted Grijalva’s membership in the Congressional Hispanic Caucus and status as co-chairman of the Congressional Progressive Caucus.