WASHINGTON (AP) — Both President Joe Biden and his predecessor, Donald Trump, are hoping to provide their parties late boosts on the last full day of campaigning before midterm elections that could reshape the balance of power in Washington.

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Biden is holding a Monday evening rally in Maryland as Democrats eye retaking its governorship.

Trump is set to stage his own event in Ohio, where his hand-picked Senate candidate, JD Vance, is running in a state that has turned more reliably red in recent cycles.

Republicans are optimistic about winning enough seats to retake control of both the House and the Senate, while Democrats insist they are poised for a better night than many expect.

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Answers to 25 common COVID-19 vaccine questions

Vaccinations for COVID-19 began being administered in the U.S. on Dec. 14, 2020. The quick rollout came a little more than a year after the virus was first identified in November 2019. The impressive speed with which vaccines were developed has also left a lot of people with a lot of questions. The questions range from the practical—how will I get vaccinated?—to the scientific—how do these vaccines even work?

Keep reading to discover answers to 25 common COVID-19 vaccine questions.

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