Republicans still voting against McCain

It's not clear yet whether the results are a real cause for concern for John McCain, but the presumptive Republican nominee still isn't exactly sweeping the primaries.

In Indiana on Tuesday, McCain won 78 percent of the vote, while Mike Huckabee won 10 percent, Ron Paul won 8 percent, and Mitt Romney 5 percent. In that state's open primary, about 11 percent of voters in the Democratic primary were self-identified Republicans who crossed over.

In North Carolina, the anti-McCain vote was ever higher. McCain drew 74 percent, Huckabee 12 percent, Paul 8 percent, and Alan Keyes 3 percent. Four percent of voters went to the polls and picked "no preference."

In Pennsylvania two weeks ago, McCain also only won 73 percent of the vote. He effectively clinched the nomination after the March 4 primaries, which forced Huckabee from the race.

There is historical precedent: The same scenario played out for George W. Bush in 2000, the most recent contested Republican primaries.

Still, for someone still striving to unite the Republican Party, higher numbers would be more comforting.