After this week's contests Mr Obama has the majority of the pledged delegates.

本周过后，承诺代表当中大多数支持奥巴马。

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Proportional representation makes it hard for either candidate to claim big chunks of pledged delegates in one bite.

美国的比例代表制使得任何一名候选人都无法一口吃掉绝大多数的宣誓代表票。

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Barack Obama, garnering an overall majority of pledged delegates on May 20, defeated Sen.

CNN: States to Watch

Thirty-one pledged delegates are up for grabs Tuesday in Montana and South Dakota.

CNN: Steady stream of superdelegates pushed Obama over top

But Obama won more states, 13, and leads Clinton in pledged delegates, according to CNN calculations.

CNN: Analysis: McCain clear leader; split decision may help Obama