John Edwards Endorses Barack Obama - What does it All Mean?

Today, John Edwards officially endorsed Barack Obama’s campaign for President, and as we prepare for this story to get churned through the news cycle over the coming weeks, let’s take a step back and think about the significance of this endorsement for the Democratic primary.
 
The Math
First, the objective meaning of Edwards’ endorsement: with 18 pledged [...]

Edwards to Endorse Obama Tonight

The Net is abuzz with word that John Edwards will be endorsing Barack Obama tonight in Michigan. Note the location of the endorsement… the very state where neither Obama nor Edwards were on the ballot. Will this be looked back on as the moment when the Fall Campaign began in earnest? [Via Huffington Post]