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The turnout is set to be between 40 and 45 percent
In Bulgaria, three parties - GERB, BSP and MRF - will receive 17 out of 18 seats in the upcoming European Parliament elections in late May.
Even before it is officially launched, the election campaign is already too fierce, because political analysts view this vote as indicative of the sentiment towards the governing GERB party.
Political Analysis by Plamen Asenov.