She urged her supporters to set aside any ill-well left from the close primary campaign and put their energy and passion into electing Obama.

``Life is too short, time is too precious, and the stakes are too high to dwell on what might have been,'' Clinton, 60, told a crowd of more than 1,000 supporters gathered today at the National Building Museum in Washington. ``We have to work together for what still can be. And that is why I will work my heart out to make sure that Senator Obama is our next president.'' ...