Manikavasagam was elected to Parliament in the
2008 election, winning the seat of Kapar, previously held by the
Barisan Nasional (BN) coalition. Before his election, Manikavasagam was a prominent leader in the
Hindu Rights Action Force (HINDRAF). In December 2008, Manikavasagam announced he would leave PKR, citing disappointment with the party's leadership in Selangor. He eventually resigned from a leadership position within PKR, but not from the party itself. In June 2009, an arrest warrant was issued for Manikavasagam after he allegedly refused to respond to a subpoena to testify at an inquest into the death of an actress. Manikavasagam applied to have the warrant set aside, and eventually testified at the inquest. Less than two weeks later, he was arrested over an unrelated public demonstration. PKR did not renominate Manikavasagam to defend his
Kapar parliamentary seat in the
2013 election. He contested the
Selangor State Legislative Assembly seat of
Bukit Melawati instead, losing to a
United Malays National Organisation (UMNO) candidate. In 2014 he was suspended from PKR for making allegations of "money politics" against the Selangor Chief Minister
Khalid Ibrahim. After the lifting of his suspension, he challenged Khalid for the leadership for the Selangor division of PKR, and won, part of a series of events culminating in Khalid's downfall as Chief Minister later in the year. On 7 April 2018, he announced that he has rejoined
Parti Rakyat Malaysia (PRM), a party which he first joined in 1999 before leaving for PKR in 2000. He also contested for the Kapar parliamentary seat and Meru state seat in the
2018 election under PRM ticket but lost both. ==Election results==