Alabama Republicans will cast votes for their Senate nominee today. If no candidate takes 50% of the vote, there will be a runoff election on Sept. 26 — a likely outcome. The choice is between a candidate that has the support of the president and one of two opposers who echo Trump's populist message.

• Luther Strange, the incumbent, was appointed after Sen. Jeff Sessions became attorney general. Strange has the support of President Trump and Majority Leader Mitch McConnell, whose allies have funneled millions of ad dollars into his campaign.
• Roy Moore, the front-runner, is a former Alabama chief justice. His campaign strategy most closely aligns with Trump's, with ads that promise he'll "drain the swamp."
• Rep. Mo Brooks, the anti-McConnell candidate, echoes Moore's anti-establishment message. His ad addresses Trump directly: "Mr. President, isn't it time we tell McConnell and Strange, 'You're fired?'"