Tripura Chief Minister Biplab Kumar Deb on Saturday said he has submitted his resignation to Governor SN Arya, adding that the party wants him to "work to strengthen the organisation". The shock resignation comes ahead of state polls next year. Manik Saha is the new Chief Minister. This is not the first state where a BJP Chief Minister has suddenly resigned close to elections. What's the reason behind this change of guard- and will it really impact Tripura results?