Mark Penn, who is Sen. Hillary Clinton’s top election strategist, has been very vocal in recent weeks about Sen. Barack Obama’s campaign contributions from Exelon Corporation, a nuclear giant.

The Clinton campaign and Penn in particular have blasted Sen. Obama for pushing for soft legislation that would advise (instead of require) power companies to report nuclear leaks, after it came out that Exelon has for years failed to report when they neglected to properly contain radioactive waste.

The reason for the wishy-washy legislation, the Clinton camp said, was because Exelon is one of Sen. Obama’s biggest contributers, having given $227,000 to his election bid.

And yet Penn’s consulting firm Burson Marsteller was just paid $230,627 to help the power company renew a nuclear energy license in New Jersey. The campaign dismissed the revelation, with one spokesman saying:

“I dont recall Exelon sitting in Senator Clinton’s office watering down legislation designed to protect people from nuclear leaks.”

Perhaps Exelon wasn’t sitting in her office, but they seem to have been waiting for her campaign’s advisers in the conference room down the hall.