Al Gore will endorse Barack Obama tonight in Michigan:

Throughout the long Democratic primary, Mr. Gore talked frequently to Mr. Obama. But tonight’s rally at the Joe Louis Arena in downtown Detroit marks the first time they will appear together on the same stage. The endorsement was announced – on Mr. Gore’s terms – to supporters on his vast e-mail list.

“I’ve never asked members of to contribute to a political campaign before, but this moment and this election are too important to let pass without taking action,” Mr. Gore said. He added, “Over the past 18 months, Barack Obama has united a movement. He knows change does not come from 1600 Pennsylvania Avenue or Capitol Hill. It begins when people stand up and take action.”

--Christopher Orr