As I suspected, they are coming fast and furious today...:

Chicago, IL – Today, two Michigan superdelegates endorsed Barack Obama.  DNC Members Debbie Dingell and Rick Wiener backed Obama today. Earlier this morning, Michigan superdelegate Joyce Lalonde also backed Barack Obama....

WASHINGTON - U.S. Rep. John W. Olver, D-Amherst, an undeclared superdelegate, told the Republican today that he is pledging his vote at the Democratic National Convention to U.S. Sen. Barack Obama, D-Ill., who is expected to capture the party's nomination for the presidency after today's primaries in Montana and South Dakota.. .

Chicago, IL – Today, United States Congresswoman Carolyn Cheeks Kilpatrick (MI-13) endorsed Barack Obama.