This is good news for Bernie Sanders, as Rep. Grijalva is greatly respected by progressives:

[...] Independent Vermont Sen. Bernie Sanders has drawn massive crowds from Phoenix to Seattle to Boston but has won the public support of precisely zero of his colleagues on Capitol Hill.

That, however, is about to change, as Arizona Rep. Raul Grijalva prepares to declare his support for Sanders' presidential bid. The announcement is expected Friday night when the two appear together at a Tucson rally, part of a Sanders swing through the West ahead of next week's first Democratic debate, in Las Vegas.

Grijalva, a liberal Democrat serving his seventh term representing a southern Arizona district including Tucson, is co-chairman of the Congressional Progressive Caucus, which Sanders -- a self-described Democratic socialist -- helped cofound as a House member in 1991.

Grijalva is also a member of the Congressional Hispanic Caucus and is expected to help Sanders' outreach to Latino voters.