Ukraine's main opposition chief back in race Reuters Kiev : Ukraine's main opposition leader, still undergoing treatment for a mystery ailment, has rejoined a campaign to overturn the scandal-plagued legacy of outgoing President Leonid Kuchma in a presidential election this month. Viktor Yushchenko, looking haggard and flushed, flew back to Kiev on Sunday after a second stay at an Austrian clinic where doctors failed to confirm his team's suspicions that he was poisoned to knock him out of the October 31 election. His main rival, Prime Minister Viktor Yanuko-vich, is backed by Kuchma, whose decade in office has been marked...