Calcutta, May 24: Tiger Woods and his former wife Elin, who are considering reunion, are said to be mulling a prenuptial agreement that would include a $350-million anti-cheating clause, considering the golfer's philandering ways. Closer home, the Congress has come up with a fidelity clause to keep its flock of 44 MLAs to the straight and the narrow.

The Congress today made its MLAs declare on a Rs 100 non-judicial stamp paper that they would not desert the party, a move that does not have a legal binding but appeals to moral values.

Sources said the move was prompted by fears that a section of the newly elected legislators could defect to Trinamul in the aftermath of the humiliating defeat of the Left-Congress alliance in the Assembly elections.

As many as 11 of the 42 Congressmen who had been elected in the 2011 Assembly elections switched to Trinamul over the next five years.

All the 44 Congress MLAs pledged in the two-page non-judicial stamp paper that they would keep "unqualified allegiance" to the party, would "not get involved in any anti-party activity", would not make any "negative comment" on the party's decisions and policies, would "not take any negative action to the detriment of the party" and would "abide by party guidelines".

Bengal Congress president Adhir Chowdhury said the move was his brainchild.

"This unique thought came to my mind because I was worried that my party MLAs could be wooed by Trinamul, now that it has emerged victorious with a massive mandate," Adhir said. "To pre-empt the possibility of poaching by the ruling party, I decided to have this non-judicial stamp paper signed by every Congress MLA."

Chowdhury today presided over a meeting of his party's MLAs, district presidents and candidates who lost the polls. The MLAs signed the document at the meeting, held at state unit headquarters Bidhan Bhavan.

The sources said that besides the 11 MLA who had defected to Trinamul, many civic body chiefs and panchayat functionaries across the state had crossed over.

A senior Congress leader said the party feared that Trinamul might wean away its MLAs this time too and that is why preventive measures were being taken.

According to the sources, Trinamul seems to have set its sights on Dulal Bar, the Congress MLA of Bagda in North 24-Parganas. Bar was once with Trinamul but joined the Congress after the ruling party gave the ticket to Upen Biswas. Bar defeated Biswas.

"Dulal was among those who signed the pledge today. But we are not sure if we can retain him," a Congress general secretary said. Bar was not available for comment.

Asked what steps would be taken if any MLA reneged on the vow, Adhir said: "Well, this pledge will act as a conscience keeper. I hope our MLAs will remain committed to the party."

Lawyers said making a pledge on a non-judicial stamp paper wouldn't hold good in court unless it is done through a notary public with a lawyer as a witness. Such a document can also be registered by a first-class magistrate in the presence of an advocate as a witness.

"We know the document the MLAs signed today doesn't have any legal value. This is a moral bond," a Congress source said.

The Congress today decided to join the Left in a demonstration at Esplanade's Y-channel on Wednesday and Thursday.

"We will join hands with the Left on these two days. Similarly, we have invited the Left to take part in our sit-in at the same place on the day of the swearing-in (Friday)," Adhir said.

Both the Congress and the CPM declared today that they would not attend Mamata Banerjee's swearing-in ceremony.