But 633 of the 783 pledged delegates at stake come from Southern or border states.
This resulted in a net gain for Clinton of 24 pledged delegates.
At the end of the month, Obama had 1,192 pledged delegates to Clinton's 1,035.
In the end, Obama secured 99 pledged delegates to Clinton's 94.
John McCain received the majority in the districts 1,2,3,6 and 7, so he won 15 pledged delegates.
There was 3,409.5 pledged delegates, those committed to vote for a particular candidate, selected by primary voters and caucus participants.
He earned 12 pledged delegates to Clinton's 3.
First, the Party used the results of the primary process to determine how 126 of its 193 pledged delegates would be allocated to each candidate.
Pledged delegates supporting each candidate are chosen in approximate ratio to their candidate's share of the vote.
In addition, there are 8 more pledged delegates that are allocated based on the results of the statewide primary.