A graduate of law, she now seeks re-election in a constituency where the Sangma family's influence has been unparalled for the last 30 years.
'Even if Sangma fields a stone in the poll, it will win' is the conventional wisdom on Tura's streets.
Marak, a former deputy chief minister, is only 15 years older than the sitting MP.
"My contest is not against Agatha," says Marak. "I am fighting against her father and his misrule."
The NCP is campaigning on the plank that the Congress is behind the imposition of President's Rule in Meghalaya which recently dethroned the NCP-led coalition government.
Marak feels Tura has lagged behind the rest of the northeast because P A Sangma hardly did anything for the constituency or its people all those years he represented it in the Lok Sabha.
"I want to bring about change," says Marak. "It is time for the people of Tura to look for options outside the Sangmas.