The history of the bill shows Mr. Obama navigating a home-state controversy that pitted two important constituencies against each other and tested his skills as a legislative infighter. On one side were neighbors of several nuclear plants upset that low-level radioactive leaks had gone unreported for years; on the other was Exelon, the country’s largest nuclear plant operator and one of Mr. Obama’s largest sources of campaign money.
Since 2003, executives and employees of Exelon, which is based in Illinois, have contributed at least $227,000 to Mr. Obama’s campaigns for the United States Senate and for president. Two top Exelon officials, Frank M. Clark, executive vice president, and John W. Rogers Jr., a director, are among his largest fund-raisers.
Another Obama donor, John W. Rowe, chairman of Exelon, is also chairman of the Nuclear Energy Institute, the nuclear power industry’s lobbying group, based in Washington. Exelon’s support for Mr. Obama far exceeds its support for any other presidential candidate.
In addition, Mr. Obama’s chief political strategist, David Axelrod, has worked as a consultant to Exelon. A spokeswoman for Exelon said Mr. Axelrod’s company had helped an Exelon subsidiary, Commonwealth Edison, with communications strategy periodically since 2002, but had no involvement in the leak controversy or other nuclear issues.
