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https://static01.nyt.com/images/2024/07/27/multimedia/27election-live-promo-launch-mzkq/27election-live-promo-launch-mzkq-videoSixteenByNine3000.jpgSaturday promises to be an intense day on the campaign trail, as former President Donald J. Trump and his running mate, Senator JD Vance of Ohio, as well as Vice President Kamala Harris and her surrogates hold events in key states across the country.