The United States presidential candidates of both parties focused their last minute campaigning on Sunday in 24 states holding primaries or caucuses on Super Tuesday.

Speaking in Delaware, Barack Obama offered a glimpse of the campaign he would run if he won the Democratic nomination.

''We will not just win the general election, but you and I together, we will change this country and transform the world.''

Campaigning separately, Clinton visited black churches on Sunday, hoping to ease resentment that felt her campaign disparaged the achievements of presidential riva Obama.

''What we have to determine is how we united behind our nominee, how we will take on the Republicans who, I am sorry to say, will not give up without a fight.''

Meanwhile Republican John McCain took his campaign in Connecticut. Mitt Romney scheduled stops in Illinois, and the St. Louis suburb of Maryland Heights.

And Former Arkansas Governor Mike Huckabee was concentrating on the South, with appearances in Georgia and Tennessee.