Bob Kerrey is trying to make the biggest knock against him in his comeback campaign for U.S. Senate his candidacy's chief asset. The senator says his 11 years away from Nebraska have given him a better perspective on the nation's problems. During that time, he worked as president of a New York City university and served on a commission that studied the Sept. 11 attacks. Kerrey says he's "been out" and that the world looks different to him now that he's had other experiences. A spokesman for Republican Senate candidate Deb Fischer says the only thing Kerrey gained from his experience outside Nebraska was new sources to tap for fundraising.