The wild-card party of Beppe Grillo, the grass-roots Five-Star Movement, will also not enter into an alliance.

CNN: Italy's Parliament votes for new president

The election deadlock has meant that Beppe Grillo, a former comedian and political revolutionary who led his grass-roots Five-Star Movement to third-place in the elections by promising to get rid of Italy's tired politicians and traditional political parties, would be the key to power if he were to support one of the traditional parties.

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