Gov. Bob Casey speaks to delegates of unity

U.S. Sen. Robert Casey, Jr. (D-PA)
U.S. Sen. Robert Casey, Jr. (D-PA) speaks during day two of the Democratic National Convention (DNC) at the Pepsi Center August 26, 2008 in Denver, Colorado. U.S. Sen. Barack Obama (D-IL) will be officially be nominated as the Democratic candidate for U.S. president on the last day of the four-day convention. (Photo by Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images

Gov. Bob Casey of Penn. spoke to delegates at the Democratic National Convention on Tuesday night about unity.

Casey said the fact he was speaking on the podium, despite the fact he differed with Obama on the issue of aborition, demonstrates Obama's commitment to respecting differences of ideas.