santiago billionaire ex-president sebastian pinera would come first chile presidential election sunday would fall short 50 percent vote necessary avoid runoff radio bio-bio forecast pinera see take 35.7 percent vote local broadcaster radio bio-bio say poll close second place rival center-left alejandro guillier 23.2 percent third-place leftist beatriz sanchez 20.2 percent run-off election would hold december 17. chile 's pinera see win 36 percent vote guillier 23 percent media projection