Here's what Barack Obama plans to say at 3:30 pt ET in North Las Vegas, NV:

"I just had the privilege of visiting with Felicitas Rosel and Francisco Cano at their home here in Las Vegas.

Today, John McCain is having a different kind of meeting. He’s holding a fundraiser with George Bush behind closed doors in Arizona. No cameras. No reporters. And we all know why. Senator McCain doesn’t want to be seen, hat-in-hand, with the President whose failed policies he promises to continue for another four years."

Tucker Bounds, a McCain spokesman, responds: "Whether the issue is global climate change or urging a more effective strategy in Iraq, John McCain has had clear but respectful differences of opinion with the President. However, it isn’t surprising that Barack Obama is trying to disguise his own lack of depth and weak leadership on the issues with political generalizations and superficial attacks."