washington hillary clinton consider u.s. senator elizabeth warren run mate democratic presidential ticket wall street journal report thursday cite several people familiar process warren lead progressive voice among democrats among democratic presidential candidate clinton vet vice presidential position newspaper report clinton rival bernie sanders add source tell reuters early month warren represent massachusetts consider potential role representatives clinton sanders warren immediately reply request comment report clinton democratic party presumptive nominee nov. presidential election last primary contest week district columbia although clinton sanders meet week senator vermont plan end campaign endorse clinton video speech supporters schedule late thursday spokesman say search potential partner race still early stag journal report several democrats say clinton campaign look number potential candidates include warren prospective run mat include u.s. labor secretary tom perez u.s. house urban development secretary julián castro accord report senators tim kaine virginia sherrod brown ohio cory booker new jersey well u.s. representatives xavier becerra california tim ryan ohio also consideration say los angeles mayor eric garcetti also potential candidate add warren throw support behind clinton last week former secretary state move sight nominate contest toward nov. match-up presumptive republican nominee donald trump warren could help clinton win sanders supporters party liberal wing surprisingly protract primary race sanders self-described democratic socialist yet drop also would give clinton vocal boost fight trump warren call trump threat country vow keep lash story refiled remove superfluous word endorse paragraph nine clinton consider warren sanders run mate wsj