VATICAN CITY Anticipation gripped the Catholic world Thursday as the cardinals tasked with choosing a new pope prepared to retreat behind the heavy doors of the Vatican's Sistine Chapel for their second day of voting. A plume of black smoke rose over the crowds thronging St Peter's Square late Wednesday, confirming that the conclave's first ballot had not secured a two-thirds majority to name a successor to the late Pope Francis. The 133 "Princes of the Church" spent the night sequestered in