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参考答案: For months, Senators Clinton and Obama have waged one of the longest and hardest-fought primary battles in modern American presidential history.
Rhetoric between the two contenders has often been sharp, with Clinton at one point questioning whether Obama has demonstrated the credentials necessary to be commander-in-chief, while Obama has blasted the free-trade policies adopted by Clinton's husband, former President Bill Clinton.
Some Democrats have openly wondered whether the intense intra-party fighting will weaken the eventual nominee and dim the party's chances of capturing the White House.
Sunday, the two presidential hopefuls appeared to tone down the heavy criticism and focus on party unity instead. Clinton spoke on ABC's This Week television program.
"Both Senator Obama and I have made it very clear that we will have a unified Democratic Party going into the fall elections. I have said that I would work my heart out for him. He has said he would do the same for me ."
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