More from Robert Speel.

He said Hillary Clinton's margin of victory in Massachusetts could be surprising. The latest numbers show her with a 56 percent to 41 percent margin over Barack Obama.

But while Clinton will win the state, that number could get closer if the results from college towns haven't been included yet, Speel said. Obama is doing "extremely well'' among young voters across the country, he said.

Margins of victory matter because states aren't winner-take-all for Democrats in the count for delegates. They're allotted proportionally. But it still means a large margin of victory is good news for a candidate, he said.

Many, but not all primaries and caucuses on the GOP side, are winner-take-all.

Another update: CNN is projecting Obama as winning Minnesota, Connecticut and Kansas, where his mother is from.

-- John Guerriero