Greece delayed repayment of an IMF loan on Friday and a deputy minister said the government might call snap elections if its creditors do not soften their terms, an option that an opinion poll showed four of ten Greeks support. Raising the stakes in its acrimonious negotiations with international creditors, Greece has decided to postpone payment of the 300 million euro ($338 million) loan — a highly unusual step, but one that does not yet signal a formal default.