Democrats are defending a slim Senate majority. Here's a look at the states where both parties are fighting for control.

Tech Insider : Politics
Jon Tester
Sen. Jon Tester of Montana is running in one of the most competitive races in the country.

Jemal Countess/Getty Images for JDRF

Biden needs popular down-ballot Democrats to rally support for him if he's going to win in November

Tech Insider : Politics
Biden
President Joe Biden.

AP Photo/Evan Vucci

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