U.S. Customs and Border Protection agents fired tear gas at Central American migrants who ran toward the U.S.-Mexico border on Sunday. The agency also temporarily closed the border crossing near San Diego. The FiveThirtyEight Politics podcast crew puts the current situation at the border in context and asks how much it is affecting American politics. They also preview the final U.S. Senate election of 2018, which is taking place in Mississippi on Tuesday. The race between Republican Cindy Hyde-Smith and Democrat Mike Espy is highlighting fault lines on race and geography in the South.

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