Senator Barack Obama has all but settled on his choice for a running mate and set an elaborate rollout plan for his decision, beginning with an early morning alert to supporters, perhaps as soon as Wednesday morning, aides said.
Mr. Obama’s deliberations remain remarkably closely held. Aides said perhaps a half-dozen advisers were involved in the final discussions in an effort to enforce a command that Mr. Obama issued to staff members: that his decision not leak out until supporters are notified.
Mr. Obama had not notified his choice — or any of those not selected — of his decision as of late Monday, advisers said. Going into the final days, Mr. Obama was said to be focused mainly on three candidates: Senator Evan Bayh of Indiana, Gov. Tim Kaine of Virginia and Senator Joseph R. Biden Jr. of Delaware.