Today on the presidential campaign trail

Obama, family spend Fourth of July in red-state Montana, celebrate daughter's 10th birthday ... Florida Gov. Crist, possible running mate for John McCain, engaged to marry ... Obama woos Montana and its 3 electoral votes despite state's history of voting Republican ...

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Obama and family spend Fourth of July in Montana

BUTTE, Mont. (AP)--It was a family Fourth of July for Democrat Barack Obama as his wife, daughters, sister and other relatives helped him make an Independence Day play for this reliably conservative state.

Obama paid tribute to a nation in which the son of a single mother could rise to such heights.

"I know that there is no other country out there where I could be standing before you as somebody who could potentially be president of the United States," he said at a campaign-sponsored "family picnic" for hundreds of people--part rally, part birthday party for his oldest daughter, Malia, who turned 10 on Friday. "We are going to change the world."

Cheers greeted Obama, his wife, Michelle, and their two daughters everywhere. As they arrived to watch the Fourth of July parade, the crowd broke into a rendition of "Happy Birthday" for Malia.

Obama joked that he had to tell the birthday girl not to get caught up in all the fuss.

"All the fireworks and stuff are not just for her," he said to laughs.