Columbia University protesters prepare for Iran's president BY MATT SOLARS, KATHLEEN LUCADAMO and NICOLE BODE DAILY NEWS WRITERSSaturday, September 22nd 2007, 4:00 AM Columbia University students plan mass protests to greet Holocaust-denying Iranian President Mahmoud Ahmadinejad when he arrives on campus Monday to give a lecture.Students planning the demonstration on the steps of Low Memorial Library papered the area with posters yesterday depicting public executions of gays in Iran."Any student who cares about freedom of sexuality and freedom of religion should stand up and protest against this murderous dictator," said Sharona Getz, 22, who was taping up signs in...