Barack Obama could stake a claim to the Democratic presidential bid as primary votes are counted Tuesday in Oregon and Kentucky.

The Illinois senator is on track to grab a majority of pledged Democratic delegates for the party nod. That could persuade remaining uncommitted superdelegates to throw support his way.

Hillary Rodham Clinton is favored to win in Kentucky, where she's campaigned heavily in the past week. She says Obama doesn't have the votes yet to be acting like the Democratic nominee.

Obama is expected to win today's mail-in primary in Oregon, where he was greeted by a estimated crowd of 75,000 people at an event over the weekend. He'll spend the day in Iowa, which gave him a victory in the first test of the primary season in January.