hillary Clinton rolled to victory in four more states Tuesday, putting her 90 percent of the way toward clinching the Democratic presidential nomination.<br />The Democratic front-runner expanded her all-but-unstoppable march with wins in Maryland, Pennsylvania, Connecticut and Delaware.<br />But Bernie Sanders stopped her from sweeping the night with a win in Rhode Island.<br />Already, Clinton can lose every remaining primary by a wide margin and still capture her party's nomination.<br />Still, Bernie continues to attract tens of thousands to his rallies and raise millions of dollars online.<br />He's vowing to stay in the race through the last primary contest in June.<br />He would need to win more than 81 percent of the remaining delegates and uncommitted superdelegates.<br />He's only been winning 38 percent.