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Special reports - BBC News

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Elizabeth Warren, Bernie Sanders, Pete Buttigieg and Joe Biden."></div> <!--[if lt IE 9]> <img src="https://ichef.bbci.co.uk/news/304/cpsprodpb/C9C3/production/_110015615_index_image3-nc.png" class="js-image-replace" alt="Image showing Donald Trump winking at possible Democratic challengers Elizabeth Warren, Bernie Sanders, Pete Buttigieg and Joe Biden." width="976" height="549" /> <![endif]--> </div> </div> <h3 class="bold-image-promo__title">Which Democratic candidate will take on Trump?</h3> </a> </div> <div class="features-and-analysis__story" data-entityid="features-and-analysis#2"> <a href="https://web.archive.org/web/20200306104348/https://www.bbc.co.uk/news/world-us-canada-50097838" class="bold-image-promo"> <div class="bold-image-promo__image"> <div class="responsive-image responsive-image--16by9"> <div class="js-delayed-image-load" 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