[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/04/15/art.frank.ap.jpg caption=" Frank is a backer of Hillary Clinton."](CNN) - A prominent backer of Hillary Clinton's White House bid said Tuesday whichever Democratic candidate is trailing after the last round of primaries should immediately drop out.
In an interview with the Associated Press, Rep. Barney Frank said the Democratic race should not continue past the last two primaries on June 3 and said one of the candidates should even consider getting out "sooner" if it seems inconceivable he or she could win the nomination.
Clinton currently trails Obama by 171 pledged delegates in the most recent CNN count. It remains virtually impossible for the New York senator to close that gap, even if she wins the remaining primaries by large margins. But neither candidate can amass the necessary 2,025 delegates needed to capture the nomination without the support of superdelegates, leaving the ultimate decision in the hands of those elected officials and party leaders.
It also remains unlikely Clinton can catch Obama in the popular vote, even if the results of the disputed primaries in Florida and Michigan are factored in.