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Arizona’s McSally offers a case study in GOP primary politics

Rep. Martha McSally (R) wanted to appear moderate on immigration issues. Then she entered a statewide primary in Arizona.

House Homeland Security Border and Maritime Security Subcommittee Chairwoman Rep. Martha McSally, R-Ariz., speaks during a news conference with House Judiciary Committee Chairman Rep. Bob Goodlatte, R-Va. on Capitol Hill in Washington, Jan. 10, 2018.
House Homeland Security Border and Maritime Security Subcommittee Chairwoman Rep. Martha McSally, R-Ariz., speaks during a news conference with House Judiciary Committee Chairman Rep. Bob Goodlatte, R-Va. on Capitol Hill in Washington, Jan. 10, 2018.AP

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."