WASHINGTON: Liberal White House hopeful Bernie Sanders declined to bow out of his race against Hillary Clinton on Thursday, declaring that his “political revolution must continue” and urging supporters to help reform the Democratic Party. But he stressed that he was prepared to work with his rival in order to best presumptive Republican nominee Donald Trump. “The major political task that we face in the next five months is to make certain that Donald Trump is defeated and defeated badly,” Sanders said in a webcast to supporters. “And I personally intend to begin my role in that process in a very short period of time.” Former secretary of state Clinton has for all intents and purposes won their at-times bitter battle for the Democratic nomination. Last week she clinched the number of delegates needed to become the party flagbearer next month at its national convention, and she shifted weeks ago to her likely showdown against Trump.