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.
Eranakulam is one of Indian National Congress’s last remaining advantages in the state, with strong moats in Thrikkakara, Kochi, Eranakulam and Thrippunithura. The district swings UDF and is critical for UDF to retain power in the state. The district swings right with 6 constituencies leaning UDF and 1 leaning left. 7 are up for grabs. In 2011, UDF won the district 11-3.