Clinton, Obama in dead heat ahead of big vote

Democrats Hillary Clinton and Barack Obama were locked in a near dead heat two days before the biggest presidential voting so far while John McCain tried to nail down the Republican nomination for the White House. Reuters

The problem with this is that while the Republican primaries work on a “winner takes all” principle as far as the delegates are concerned while the Democratic ones don’t. If McCain should win in a state by just 1 vote he will have ALL the states’ delegates. But Obama and Clinton do not get all the state’s delegates but only as many as they gained percent in the state.

As a result of this Obama and Clinton may keep very close to each other up until, or even including, the convention, while the Republicans already have effectively picked their candidate.