From NBC/NJ's Matthew E. Berger
PHILADELPHIA -- Sen. Bob Casey just finished speaking at the Pennsylvania AFL-CIO conference, and appeared well aware that he was speaking just an hour before Clinton.
Casey, who endorsed Obama with much fanfare last week, struck a conciliatory tone, saying that while he had made a choice, he believed both Democratic candidates would enjoy strong union support.
"We have to be honest with each other about differences, even difference that may melt away in the months ahead," he said. "We're gonna have a debate, we're gonna have a discussion, we might even have a few arguments, but in the end of this process, Democrats will come together."
Obama will address the AFL convention tomorrow.