Better be careful what you say in the heat of a political campaign. It could have global repercussions.

Presidential contender Sen. Hillary Rodham Clinton's vow to "obliterate" Iran, presumably with nuclear weapons, if it attacked Israel on her watch was duly noted in the U.S.

[UPDATE: To see a video and full transcript of the comment, click here.]

Jaded American insiders shrugged off the remark as typical campaign season bluster, filed away with myriad other exaggerations and gaffes.

But it prompted shock overseas as well as headlines from Bulgaria to New Zealand.