Conversation so far:
in what month was the election?
the 2014 Lok Sabha election.
what position did he run for in the election?
prime minister.
what political party was he in?
the BJP's candidate.
did he win the election?
Modi's tweet announcing his victory was described as being emblematic of the political realignment.
how many votes did he get?
by 570,128 votes.
who was his opponent?
defeating Aam Aadmi Party leader Arvind Kejriwal in Varanasi.
for how long was he prime minister?
To comply with the law that an MP cannot represent more than one constituency, he vacated the Vadodara seat.
where did he do his campaigning?
The BJP's campaign was assisted by its wide influence in the media.
Modi's campaign blitz cost approximately Rs50 billion.

Question: where did he get the money from to pay for that cost?
Self-contained rewrite: Where did Narendra Modi get the money from to pay for the cost of his BJP campaign?