Why was a second Greek parliamentary election held in June 2012?

A second Greek parliamentary election was held in June 2012 because the results of the May 2012 election failed to produce a viable government.1

In the May election, the country's two mainstream parties—New Democracy (ND) and the Panhellenic Socialist Movement (PASOK)—received only about 19 percent and 13 percent of the vote, respectively. Because no party was able to secure enough support to form a coalition government, voters were required to return to the polls in June to resolve the political impasse.21