Senate candidate Christine O'Donnell chats with voters in Wilmington, Del., on Tuesday. Ms. O'Donnell took on nine-term Rep. Michael N. Castle in the Republican primary for a U.S. Senate seat. (AP Photo)

Senate candidate Christine O'Donnell chats with voters in Wilmington, Del., on Tuesday. Ms. O'Donnell took on nine-term Rep. Michael N. Castle in the Republican primary for a U.S. Senate seat. (AP Photo)