Romney was expected to win at least 12 Michigan GOP delegates, according to CNN estimates.
But Obama won more states, 13, and leads Clinton in pledged delegates, according to CNN calculations.
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The battle in the Democratic Party has a long way to go, partly because its system awards each candidates a share of the delegates to the nominating convention according to their share of the vote in each primary.
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But the Democrats share out delegates between candidates according to their support in each state and Mr Obama has gained a sizeable clutch of them even in the big states where he came second.
According to the latest CNN estimate, Obama has 1, 845 total delegates to Clinton's 1, 686.
"We need to continue to stand united - chiefs, delegates, " Mr Atleo said, according to broadcaster CTV.
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According to CNN's latest estimate, Romney has secured 569 delegates and needs 575 more to reach the 1, 144 required to clinch the GOP nomination.
According to the latest CNN delegate estimates, Obama has 1, 978 total delegates to Clinton's 1, 780.
Clinton currently trails Obama across all fronts -- superdelegates, pledged delegates and the popular vote, according to CNN's latest estimates.
However, according to South Korean press reports, the North Korean delegates quickly ended discussion of the nuclear programme, saying it was up to the United States to find a solution.
Paul, who's making his third bid for president, has failed to win a single contest this cycle and trails in the delegate race with 72 delegates to Romney's 685, according to CNN estimates.
Obama has 1, 862 total delegates and Clinton has 1, 697, according to a CNN survey.
In total delegates, Obama now tops Clinton 1, 208 to 1, 185, including superdelegates, according to CNN estimates.
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If so, according to an article in Salon, an online magazine, Mrs Clinton would now be leading Mr Obama in pledged delegates by 1, 743-1, 257.
This year 34 private entrepreneurs have been chosen as delegates to the Congress, up from just 17 at the 17th Party Congress in 2007, according to statistics revealed by state-run China Economic Weekly.
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In an unusual system, the 193 delegates that Texas will send to the Democratic National Convention will be split between Obama and Clinton according to the results of both the primary and the caucuses.
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