Indian National Congress has won two thirds of all elections in Wayanad since 1982, but in recent times all three assembly constituencies in the district are in play with LDF winning Mananthavady, Sulthanbathery and Kalpetta in 2006. Median margin in Mananthavady and Kalpetta are above 10% which is above average and shows clear waves and swings.
Thrissur is home to Ollur, the only true bellwether of Kerala elections. A swing district, Thrissur has 5 LDF leaning constituencies including left bastion of Kaipamangalam and one UDF fort manned by Therambil Ramakrishnan. With 7 swing constituencies, Thrissur decides how central Kerala swings. A notable constituency is Kunnamkulam characterised by wafer thin margins.
Thiruvananthapuram is a classic bellwether district with LDF and UDF virtually splitting the 98 elections since 1982 in half. Bharatiya Janata Party’s biggest bet in 2016, Trivandrum has 4 UDF leaning seats and 3 that lean LDF, including two left bastions of Attingal and Chirayinkeezhu. Half the constituencies have a habit of swinging either way and hence the district more often than not reflects the mood of the state’s electorate.
Palakkad is CPM's district and it's deep ties with working class delivers near two thirds of the seat in the left's account . Constituencies in Palakkad are Alathur, Chittur, Kongad, Malampuzha, Mannarkkad, Nenmara, Ottappalam, Palakkad, Pattambi, Shornur, Tarur and Thrithala.
Malappuram belongs to Indian Union Muslim League. There would be very few places in the country where elections are so one sided. It isn’t the fact that 14 of 16 constituencies swing UDF, but the median margin of victory and the unsurmountable lead Muslim league has in some of these places which is impressive.
Kasaragod leans LDF. BJP has a significant vote share in the district, it’s highest in the state, but this vote share has declined since 1982. Manjeshwaram still remains party’s best bet to open an account in 2016. Then that was the case in 1982, and every election since. Then BJP has struggled to go beyond the 20% mark.