Major Endorsement to Be Announced by Obama Campaign Tonight

Saw across the blogosphere that there is a major endorsement to be unveiled tonight at 6:30 pm EST by the Obama Campaign.

Some are speculating that it is John Edwards. If that's the case, it would be an example where a non-superdelegate endorsement actually impacts the election in a meaningful way.

I wrote earlier here about the "Edwards Primary", as first described on Mr. Super in which Edwards by dropping out of the race (instead of suspending it, as he did) could effectively move those 19 pledged delegates he's won in Iowa, New Hampshire and South Carolina over to Obama. This type of 19-delegate swing would be bigger than Clinton's net gain in Indiana and West Virginia combined.

Others have speculated that it's Al Gore or someone of that magnitude. Still others are reading into the cryptic announcement that perhaps it's a major block of superdelegates set to endorse, not just one endorsement. There were hints of a major block of North Carolina superdelegate endorsements earlier in the campaign.

It will be interesting to see if this endorsement has more of a direct or indirect impact on the delegate race between Senators Obama and Clinton.