Barack Obama has picked up the support of Colorado superdelegate Pat Waak, the state party chairwoman.
Waak endorsed Obama on Wednesday, the day he is scheduled to campaign in Colorado.
She notes he won the state's Feb. 5 caucuses and more recently performed strongly at state, county and congressional district conventions. She says she believes he'll defeat Republican nominee-in-waiting John McCain in the general election.
Obama has 1,979 delegates -- 47 shy of the 2,026 necessary to clinch the nomination. Rival Hillary Rodham Clinton has 1,779 delegates.