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Voters in a record number of states — including the battlegrounds of Arizona and Nevada — are set to decide this fall whether to enact far-reaching changes to how their elections are run.

The Department of Health and Human Services says it will require new vaccines to be tested against a placebo, which could complicate and delay Food and Drug Administration approval of many vaccines.

History is made: Claudia Sheinbaum has won Mexico's election by a landslide to become its first female president.

President Trump's effort to "rein in" independent agencies is raising particular concern among those who follow the work of the Federal Election Commission, which enforces campaign finance laws.

The Kentucky Republican has served more than 40 years in the chamber, and became one of the most consequential and divisive legislators in recent history.