Tharoor Likely to Change Colour?

Tharoor, MP from Thiruvananthapuram, Kerala time to time praises the PM, sources say this has given hope to an ex-minister from Kerala to offer him to join BJP. Source says he said to the MP that during the last elections also BJP got more than three lakh votes and since then BJP already improved its position so to win he will have to come to BJP. Probably offer has also been given to contest from New Delhi seat but the final word has not come from Tharoor?