Marking the beginning of Shiv Sena's poll campaign for the upcoming parliamentary elections, party chief Uddhav Thackeray on Thursday launched an attack on Congress led Central government calling Dr. Manmohan Singh as the weakest Prime Minister country has ever had.

The rally in Mumbai on the occasion of birth anniversary of Sena founder late Bal Thackeray, is widely seen as party's show of strength.

"Our PM has absolutely no value at all, neither in his party nor in the government. He is the weakest PM ever," he said. Mr. Thackeray also said that if such weak PM comes to power again, the country will be ruined completely.

"The next PM will be from us. Congress can't give a single candidate, rather they don't have any. Only we have given a face in this elections," he said, without naming Narendra Modi. Sena sources in the past had expresses their discontent over Mr. Modi for not even mentioning late Bal Thackeray during his speech in a rally at Mumbai.

In an attempt to create an emotional connect with the party workers, Mr. Thackeray distributed the saffron thread called 'shiv bandhan' among sainiks asking them to tie it around their wrist as a mark of allegiance to Sena.

The party members were given a pledge firstly through a video recording of late Bal Thackeray and lastly by Mr. Uddhav, asking them to surrender their allegiance to party and towards bringing NDA to power, both in state and in center.