The story

In what he called a "defining moment for our nation," Sen. Barack Obama on Tuesday became the first African-American to head the ticket of a major political party.

Obama's steady stream of superdelegate endorsements, combined with the delegates he received from Tuesday's primaries, put him past the 2,118 threshold, CNN projects.

"Tonight we mark the end of one historic journey with the beginning of another -- a journey that will bring a new and better day to America," he said. Read full article »

CNN's Candy Crowley, Jim Acosta, Suzanne Malveaux, Paul Steinhauser and Robert Yoon contributed to this report.

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