Hubballi/ Hassan: Union minister Pralhad Joshi has said that though there are ideological differences with Siddaramaiah, he condemns the political development of blackmailing former CM by showing a pen drive.Speaking to reporters after casting his vote at Karnataka West Graduatess’ Constituency poll here on Friday, Joshi said developments in Congress show that someone are doing whatever they want for power. “It’s a worrisome development that values in politics are falling down. Congress high command should reveal the conspiracy. There is an allegation that Siddaramaiah was forced to quit as CM by showing a pen drive. The state govt should trace that who is there behind such an allegation,” he pressed.JD(S) seeks CBI probe into stingThe Hassan district unit of the JD(S) will stage a protest on Oct 28, demanding a CBI investigation into the sting operation that has triggered a political storm in Karnataka and the arrest of those allegedly involved.Speaking to reporters, the district JD(S) president Nataraj said sting operations were generally conducted to expose bribery and misuse of official power. However, using them for political gain, to tarnish reputations and secure positions was unfortunate.He said it was particularly ironic that former CM Siddaramaiah, an experienced politician with a reputation for clean administration, had become the target of such an operation. He alleged that the involvement of people from within the ruling party had damaged the political system.He said BJP members would also participate in the Oct 28 protest.