Dr Bal Sharma has not given age a moment's thought in his determination to run for the Kansas legislature from District 54 in Topeka as a Republican.
The Massachusetts senator's win reportedly locks up the delegates he needs to win the Democratic Party's nomination.
Even as he was being sworn in inside the Supreme Court, scores of people protested across the street at the Capitol.
Kansas Governor San Brownback has written a letter to Prime Minister Narendra Modi expressing "profound regret" at the terrible act of violence against the Indian nationals last month and said that acts of hate and intolerance have no place in his state.
Dr Shanti Gandhi, a great-grandson of Mahatma Gandhi, is seeking a second term in the Kansas House of Representatives from the 52nd District.
The move was taken to honour Srinivas Kuchibhotla, who was killed when 51-year-old US Navy veteran Adam Purinton opened fire at him at his friend at a bar.