The following is from the May 24, 2008, edition of The International Herald Tribune. SMU Political Science Professor Cal Jillson provided expertise about political gaffes for this story.

Democrats take White House campaign to Puerto Rico

By Jeff Mason

BAYAMON, Puerto Rico — Democratic White House candidates made rare campaign stops in Puerto Rico on Saturday as Hillary Clinton's uphill challenge to secure the nomination was made even harder by controversy over her references to the 1968 assassination of Robert Kennedy. . .

Clinton's comment brought up the taboo topic of the possibility of a rival's assassination, and political analysts said the remark was a serious gaffe.

"This is serious. It's more serious because there were already questions about why Hillary Clinton was still in the race and what she was hoping for," said Calvin Jillson, political science professor at Southern Methodist University.

Jillson said the comment indicates that perhaps Clinton is holding out because she thinks some catastrophe might happen.

"What she articulated was the most catastrophic possibility," he said. Jillson said the reference to Kennedy's assassination makes the chance of Clinton being asked to be Obama's vice presidential running mate even more unlikely.

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