washington u.s. senator bernie sanders return washington meet thursday president barack obama senate minority leader harry reid democrats pressure end presidential campaign support hillary clinton hard-fought primary race clinton former secretary state u.s. senator first lady secure enough delegate secure democratic nomination week become first woman lead major u.s. party presidential nominee despite clinton command victories california new jersey presidential contest tuesday sanders vow carry populist campaign democratic national convention july party nominee formally choose obama expect endorse clinton soon schedule meet sanders white house thursday 11:15 a.m. 1515 gmt sanders meet reid senate colleague afternoon sanders campaign wag unexpectedly strong challenge better-known better-funded democrat decry call clinton anointment party establishment media interview tap wednesday broadcast nbc tonight show thursday obama say hop divisions democrats would start heal come weeks clinton clinch party nomination nov. presidential election fund-raiser new york city wednesday obama say worry bruise feel primary say healthy thing democratic party contest primary obama praise sanders democratic socialist senator vermont bring new energy ideas party push party challenge say think make hillary good candidate democrats strike delicate balance need unite behind clinton loom battle presumptive republican nominee donald trump alienate sanders supporters u.s. senator elizabeth warren progressive know fiery critic wall street prepare endorse clinton come weeks stay neutral democratic primary people familiar think tell reuters sanders return washington meet obama next step