I have heard from family members who were approached by party workers asking to swear on god to get money. But they refused. It doesn’t happen in rich and posh areas they target less developed uneducated neighborhoods.
There is no doubt in some remote corner of India some party worker might ask people to swear on their kids, gods and what not. But let me confirm that it is not even a phenomenon. Mostly figure of speech. OP used graphic details as if it is some cult practice "For Hindu voters, a plate with oil lamp, an idol, a mixture of auspicious powder is used."
Either the party worker has to be naive to believe that such ritual has any value or the people have to be completely stupid. Poor people are desperate and will happily take whatever money that comes their way and will not care too hoots about swearing on Gods. Remember if you can do a ritual to swear on God another one can invent a ritual to free you from that oath.
I don't understand why this is being down voted. The op is backing his argument with a link to national news paper and he is getting down voted. This post getting down voted is the proof of educated people still having caste feelings within them. Thanks to the Indian Constitution, without it most of population in India would never had education.
I am not sure what your agenda is, but your response is disingenuous. You have taken a specific and rare incident which was reported for its "shock value" (it is quite easy in India to publish a story with an agenda) and have presented it in a manner which implies it is some sort of a norm.
While there certainly is corruption, given the size and scale of elections in India, it is laudable that things are conducted in a proper manner for the large part.