The Internal Revenue Service this week will publish a final rule requiring Obamacare health insurance exchanges to hand over key personal data to the IRS, which will use the information to implement the tax aspects of the controversial health care law. The IRS rule covers health exchanges that sell insurance to individuals, and it takes effect this year. That means people enrolled in an Obamacare exchange this year will have their information given to the IRS as soon as it’s needed for tax purposes. Information to be handed over from Obamacare exchanges includes names, addresses, taxpayer identification numbers, insurance premium...