Warren drops out, "not ready" to make endorsement; Senate GOP ramps up investigations as Biden surges; Trump and VP Pence take different tones on coronavirus; Sanders says political establishment is "working frantically to defeat us";

Dow plunges, nearly wiping out Wednesday's gain; Warren: If you say there was sexism in this race, "everyone says whiner"; Sanders, Biden praise Warren after she drops out of race; Sen. Romney criticizes GOP efforts to investigate Burisma; Sanders says political establishment is "working frantically to defeat us"; Trump says he'll make Burisma a 'major' campaign issue; Trump disputes W.H.O. on virus death rate, citing his "hunch"; Trump's comments on coronavirus add to confusion; Coronavirus spreading across 17 states, 200+ infected; Cruise ship docks off California coast over virus fears; At least 12 confirmed deaths in U.S. from coronavirus outbreak; Pence: Gets first-hand look at supplies to combat coronavirus; Pence: Not enough coronavirus tests exist to meet demand; Airlines, big tech take action to reduce risk of coronavirus; Airlines reduce flights, big tech companies restrict employee travel to stop spread of coronavirus; Jared Kushner sells shares worth $25-$50 million in company benefiting from Trump's tax overhaul; Trump refutes top health officials on coronavirus just weeks after downplaying traumatic brain injuries; Trump's downplaying of troops' traumatic brain injuries renews grief for some military families & vets;

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