WASHINGTON -- Slowly but steadily, a string of Democratic Party figures is taking Barack Obama's side in the presidential nominating race and raising the pressure on Hillary Clinton to give up.

Sen. Amy Klobuchar of Minnesota is expected to endorse Sen. Obama Monday, according to a Democrat familiar with her plans. Meanwhile, North Carolina's seven Democratic House members are poised to endorse Sen. Obama as a group -- just one has so far -- before that state's May 6 primary, several Democrats say.

Helping...