Democratic presidential candidate Barack Obama is making preparations to visit Casper and Laramie this week, sources close to the campaign say.

An official at Natrona County International Airport, who spoke on condition that he not be named, confirmed that Obama plans to come to Casper within the week. Information about where the candidate may speak was not available.

Meanwhile, the Obama campaign and the University of Wyoming are expected to announce Wednesday morning details of the candidate's appearance at the Arena-Auditorium in Laramie.

Neither the Obama campaign nor UW officials would confirm the Wyoming visit. A source close to the campaign said the candidate is expected to speak in Laramie on Friday night.

State Democratic Party Chairman John Millin of Cheyenne said he didn't think the Obama campaign had made a final decision about a visit to Wyoming, where Democrats will hold county caucuses on Saturday. But he said he knew that the campaign had been "exploring possibilities" with UW officials about an appearance there.

"It's a lot easier to cancel at the last minute than to put something together," Millin said.

"It depends on what happens today," Millin added, referring to important primaries in Texas and Ohio. "I assume that if the race is still competitive … probably both candidates will come to Wyoming."

A spokeswoman for the Hillary Clinton campaign said she had no information about any planned Clinton appearances in Wyoming.