Speculation Rises on Greenspan's FutureWASHINGTON - His pointed criticism of the Bush tax plan showed that Alan Greenspan (news - web sites), often taken to task for being too murky in his economic pronouncements, can be crystal clear when he wants to be The Federal Reserve (news - web sites) chairman warned that further tax cuts should be paid for, leading Democrats to proclaim that Greenspan had delivered the "kiss of death" for President Bush (news - web sites)'s $1.3 trillion proposal. GOP lawmakers fumed. Greenspan, himself a Republican, had stabbed them in the back, they said. The White House...