PORT OF SPAIN, Trinidad - Last month it was Tobago. Last week it was the whitewash defeat of the Tillman Thomas government in Grenada, then the narrow electoral victory of the government in Barbados. That ferment of the Caribbean people may be enough for observers to sight a trend—one that should be disquieting for other regional governments. Every Caribbean politician might be now alert and agitated, demanding that their backroom strategic teams turn on the lights, because there is something stirring out there.