In his first public speech after announcing his decision to enter politics, superstar Rajinikanth today said that there is a vacuum in Tamil Nadu politics which has compelled him to step in. "When there were two strong leaders like Jayalalithaa and Karunanidhi, there was no vacuum... Tamil Nadu needs a leader and I have come to fill in," the 67-year-old said to loud cheers from a nearly 5,000-strong crowd, which had gathered at a private university just outside Chennai.