The party comes second in the Krishnaganj Assembly by-election

Since the 2014 Lok Sabha elections, the BJP appears to have established itself as the principal opposition party in West Bengal, data from elections in the State show.
In the May 2014 general elections, the BJP’s vote share in the State jumped to a record 17.02 per cent, taking it from the fourth place in the 2009 Lok Sabha elections to the third place, behind the Communist Party of India (Marxist) and the All India Trinamool Congress. This was in a State in which the party had only one MLA 15 years ago, and that victory too came in a by-election in which it was in an alliance with the Trinamool. There have been four by-elections in the State since the Lok Sabha elections, and the party has firmly established itself as the principal opposition party, the results show.
In September, it won the Basirhat Dakshin Assembly seat in a by-election, a seat which was until then held by the CPI(M) and in which it polled fewer than 4 per cent of the votes in 2011. From 2011 to 2014, its votes multiplied 10 times. In the Chowringhee Assembly seat, it came second, its vote share growing by over 20 percentage points.
On Monday, the BJP again came second to the Trinamool in the Krishnaganj Assembly seat in the by-election, its vote tally growing 10 times of what it was in 2011, while the CPI(M)’s tally nearly halved and even the victorious Trinamool’s vote count decreased slightly. In the Bongaon Lok Sabha seat, its vote share increased, but it was 10,000 votes behind the runner-up CPI(M). “The BJP has established itself as the only alternative in West Bengal,” Siddharth Nath Singh, the party’s State in-charge, said. “By-elections don’t change an Assembly’s composition, but they do indicate a trend. The trend is that from the last State elections, to the Lok Sabha to the by-elections, the BJP’s vote share is the only one continuously rising,” Mr. Singh told The Hindu. Trinamool leaders, played down the result, saying not it but the CPI(M) need to worry about the BJP.