By Humeyra Pamuk and Jonny Hogg ISTANBUL/ANKARA (Reuters) – A quick glance at the emerging candidates for Turkey’s first direct presidential poll illustrates the dramatic change wrought in the country by Tayyip Erdogan’s 11-year premiership; “It is certainly novel, a new republic,” says Soli Ozel, a professor in political science at Istanbul’s Kadir Has University. “We really are in uncharted waters.” Prime Minister Erdogan, his popularity unscathed by a flare-up of anti-government riots and a corruption scandal, is widely expected to announce his presidential bid on Tuesday for August elections that could further strengthen his hold on power.