Rao is one of 19 observers sent by the Election Commission to the state, where there have been widespread allegations by political parties of irregularities in the voters' list.
Accusing the opposition for the presence of bogus voters in electoral rolls, the ruling Left Front in West Bengal Monday urged the visiting Election Commission observers to go for a thorough scrutiny and remove all fake names.
Defending champion Nadia Petrova was also shown the door in the quarter-finals of the German Open.
Andy Roddick and Nadia Petrova made first round exits at the French Open on Tuesday
The Russian suffered a shock defeat in the first round of the French Open, beaten 6-2, 6-2 by Akiko Morigami of Japan.
Justine Henin-Hardenne battled her way to a 6-7, 6-4, 6-3 victory over Russia's Nadia Petrova to leave the countries level at 1-1 in Fed Cup
Champion Venus Williams was knocked out of the Family Circle Cup beaten 7-5, 6-4 by 17-year-old Tatiana Golovin of France.
The second seeded Russian will play her doubles partner Anna-Lena Groenefeld, in the Family Circle Cup.
Top seed Nadia Petrova fired five aces in securing her 22nd victory of the year at the Amelia Island tournament.
Second seed Patty Schnyder was beaten by fifth-seeded Svetlana Kuznetsova of Russia in the quarter-finals.
Since making her debut at the 2013 world championships, the 19-year-old American has become an unstoppable force. Last year she became the first woman to win a "three-peat" of all-around golds at the worlds.
Nadia Petrova pulled off a stunning 6-3, 7-5 victory over the world number two and top seed.
Kim Clijsters beat Nadia Petrova 7-5, 6-7, 6-1 to set up a quarter-final clash with Venus Williams at the Antwerp Diamond Games.
The former champions lit up the courts with their amazing tennis after a wet start to the fifth day at the Australian Open.
Serena Williams revived memories of her two Australian Open titles by coming from a set and a break down to beat Russian fifth seed Nadia Petrova 4-6, 7-5, 6-3 and book a place in the fourth round on Friday.
Sania Mirza lost to Tatiana Golovin 6-4, 6-2 in the second round at the Open Gaz de France
The top seeds scored a 3-0 whitewash of France to make the grade.
Maria Sharapova beat sixth seed Nadia Petrova 7-6, 6-4 in an all-Russian quarter-final at the Australian Open.
Maria Sharapova-led Russian brigade captured four of the round of 16 berths at the Australian Open on Friday
Villagers of Shantipur and Phulia brought to Rao's notice names of voters in the list who were no more.
Defending champion Maria Sharapova was forced to drop a set before beating Patty Schnyder in the season-ending WTA Championships.
The defending champion lost to Russia's Nadia Petrova 2-6, 3-6 in the quarterfinal.
Justine Henin-Hardenne crushed Nadia Petrova 6-2, 6-3 in the semi-final
The Russian battled back from a set down to beat French Open champion Justine Henin-Hardenne in the final.
The world no. 1 will take on Farina Elia in the summit clash of the Amelia Island Championship.
Top seed Amelie Mauresmo reached the semi-finals of the Nasdaq-100 Open after a 6-1, 6-4 win over tennager Ana Ivanovic on Wednesday.
The Wimbledon champion beat Kristina Brandi of Puerto Rico 6-1, 6-4 at the $1.3 million Montreal Cup.