Larry Johnson, the blogger who first reported the existence of a video of Michelle Obama talking about “Whitey” from the pulpit, has posted this on his blog:

“New and dramatic developments. This is a heads up. I’ll post the news Monday morning by 0900 hours. Now I know why people who have seen the videotape say it is stunning. Barack’s headaches are only starting.”

… Again, at this point, this is still a rumor. And I do note that he does not promise to release the video no Monday, but to update us with news.

But if the Clinton campaign does have video of Michelle Obama saying this, Monday would be a good time to leak it. Here’s why:

1. In politics, you never want to release all the bad information about your opponent at once. Obama just resigned from his church under duress. His goal was to separate from the church. But a new video featuring Michelle would demonstrate that the problem wasn’t merely the church — that his family was enmeshed in this radical ideology.

2. Hillary will win Puerto Rico today, giving her some momentum. Obama is rumored to be announcing a large number of superdelegate endorsements on Monday, so that his victories in the Mountain West can be what puts him over the top in terms of the delegate count. This video (or confirmation that a video exists) could cause some of the superdelegates to get cold feet, or — depending how bad it is — even consider reversing course.

Another option might be to “suspend” (but not dissolve) her campaign, and release the video before the convention. I can’t see why holding the video until then would be prudent — but you never know what else she might plan on releasing in the next few weeks.

Again, this all may, or may not, be true. So far, it’s rumors on the internet. But the source (whom I’ve spoken to on the phone) seems to be credible. And it certainly does not seem unrealistic to believe that such a tape exists. Stay tuned