U.S. Presidential Campaign Trails (in chronology): Pres_Campaigns_051

Democratic U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks during a {quote}Bernie's Back{quote} rally at Queensbridge Park in Queens, NY, on October 19, 2019. The rally, at which Representative Alexandria Ocasio-Cortez (D-NY) endorsed Sanders, drew over 20,000 participants and took place shortly after Sanders was hospitalized for a heart attack at the start of the month.(For Reuters)

Democratic U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks during a "Bernie's Back" rally at Queensbridge Park in Queens, NY, on October 19, 2019. The rally, at which Representative Alexandria Ocasio-Cortez (D-NY) endorsed Sanders, drew over 20,000 participants and took place shortly after Sanders was hospitalized for a heart attack at the start of the month. 

(For Reuters)