Sen. Barack Obama and Sen. Hillary Rodham Clinton are about to take the stage to campaign together for the first time.

They're in Unity, N.H., where they both got exactly 107 votes in the nation's first primary in January.

This shouldn't be the first time that Clinton campaigns on behalf of Obama, now the Democratic nominee-in-waiting.

Political scientist Terry Madonna, of Franklin & Marshall College in Lancaster, said that he would expect Clinton to campaign on Obama's behalf in Pennsylvania, where she carried the Democratic primary by 9 percentage points.

-- John Guerriero