Another freshman Democratic senator has endorsed Barack Obama over Hillary Clinton for the presidential nomination. Minnesota Sen. Amy Klobuchar said on a conference call Monday that she had delayed her annoucement for nearly two months "because of my respect for both candidates" and that her decision reflected both the will of the state's Democratic caucus-goers and her own preference for the first-term Illinois senator.

But Klobuchar isn't among those calling for Clinton to get out before the party's national convention in late summer, which the New York senator says she won't do. "I believe that Sen. Clinton has every right to continue her campaign," Klobuchar said, but then predicted - without explanation - that the contest would resolve itself by early summer.

Klobuchar, her state's first female senator, acknowledged some struggle with not supporting the female candidate but said she thought Obama represented more substantive change, could better unify Americans and had a better chance of winning in the fall. She said both Clinton and Obama were gracious in their overtures to her. Klobuchar also said the only thing she asked Obama in return for her endorsement was to consider her 12-year-old daughter's offer to occasionally babysit for the Obamas' two girls if the family moves to Washington.