Mark Lamb secured the Republican nomination for Arizona’s 5th Congressional District in the July 2026 primary with roughly 59 percent of the vote, overcoming multiple allegations of misconduct that surfaced during the campaign. The open seat, previously held by Andy Biggs, sits in a solidly Republican East Valley district that has favored GOP candidates by wide margins in recent cycles. Elizabeth Lee captured the Democratic primary but faces structural disadvantages in a constituency rated Solid Republican by major forecasters. With the general election set for November 3, trader consensus reflects the district’s partisan baseline, Lamb’s Trump endorsement, and the absence of competitive polling or late-breaking developments capable of narrowing the gap. A major scandal escalation or unexpected turnout surge would be required to meaningfully alter the current positioning.