FRANKFURT, Nov 21 - Lars Heikensten, Governor of Sweden's central bank the Riksbank said on Friday the political consequences from Sweden's rejection of the euro single currency were a cause for concern. "I am worried about the political consequences of the decision. The political arguments were the strongest ones for me, when I was advocating euro membership," said Heikensten. Heikensten was speaking on a panel discussion about expanding the euro zone at a European bankers' conference, Sweden resoundingly rejected adopting the euro in a referendum in September, despite almost the entire political and business establishment campagining for a "yes". He did not elaborate on what he saw as the political fallout.||