ANKARA, May 28 (Reuters) - Turkey's opposition presidential candidate Kemal Kilicdaroglu said he will continue to lead his struggle, after early results showed him losing in what he said was "the most unfair election in years" against incumbent Tayyip ErdoganANKARA, May 28 (Reuters) - Turkey's opposition presidential candidate Kemal Kilicdaroglu said he will continue to lead his struggle, after early results showed him losing in what he said was "the most unfair election in years" against incumbent Tayyip Erdogan