Many believe the implications of cash-for-vote scam of 2008 could be more dangerous than the Anna Hazare-led movement against corruption, as far as life of the Congress-led UPA-II government is concerned. "The Anna Hazare movement is not a direct threat to the government.

If any, it may have indirect effect during the next Lok Sabha polls. But the arrest of Amar Singh, along with two former BJP MPs, might be a serious threat for this government," said Ranvijay Shankar, member, Patriots' Forum. 

Main Opposition party BJP, and other parties, including communists, reacted in a similar tone and demanded a deeper probe into its role in the cash-for-vote scam, alleging it was the "real beneficiary". 

BJP spokesperson Shahnawaz Hussain said, "It has been proved that the money was given to win the no-confidence motion. Delhi Police should expand the ambit of its probe to find out Congress' role." BJP also alleged no action was initiated against the beneficiaries of the scam, while those MPs who were whistle-blowers in the case were arrested and sent to jail. Echoing, CPI(M) leader Brinda Karat said, "The UPA-I government was headed by Congress. Who were the other leaders?" 

Some political commentators, however, believe Singh's arrest was a step to recover the image of the government. "It seems Congress is trying to defame BJP to prevent it from taking advantage of the Anna-led movement," said Awadesh Kumar, political commentator.  

On the other hand, Congress denied all allegations. Parliamentary Affairs Minister Pawan Kumar Bansal said the UPA-I government was not the beneficiary, as it did not need votes of three BJP MPs, who claimed to have been bribed. Bansal also rejected the demand to ask Prime Minister Manmohan Singh to release a statement on the issue.