By Katja Lihtenvalner LJUBLJANA (Reuters) -Slovenia’s populist Prime Minister Janez Jansa looked set to lose a national election on Sunday as the environmentalist Freedom Movement party won more votes than his SDS party, according to an exit poll. The election had been expected to be tight but the exit poll by the Mediana Institute showed the Freedom Movement leading with 35.8% of the vote, far more than expected, while the SDS had secured 22.5% of the vote. That would give the Freedom Movement, which campaigned on the transition to green energy, an open society and the rule of law, 42 seats i…