There is much wisdom to that old saying, ``Be careful what you wish for; it might just come true.'' Boston Mayor Tom Menino and a boatload of civic and political leaders worked long and hard to get the Democratic National Convention to come to Boston in 2004. Their initial attempt - first to snag the 2000 convention - was well before Sept. 11. And even after the world changed, the effort to bring the convention here continued. So here we are, two months out, awaiting the arrival of 6,000 delegates, 15,000 accredited media and countless others - big shots and...