More details:
At that time, e-mail left on a third-party server for six months was considered to be abandoned, and thus enjoyed less privacy protection. However, the law demands warrants for the authorities to seize e-mail from a person's hard drive.The song remains the same, regardless of which political party is in charge... (Via R.W.)
A coalition of internet service providers and other groups, known as Digital Due Process, has lobbied for an update to the law to treat both cloud- and home-stored e-mail the same, and thus require a probable-cause warrant for access. The Senate Judiciary Committee held a hearing on that topic Tuesday.
The companies -- including Google, AOL and AT&T -- maintain that the law should be changed to reflect that consumers increasingly access their e-mail on servers, instead of downloading it to their hard drives, as a matter of course.
But the Obama administration testified that imposing constitutional safeguards on e-mail stored in the cloud would be an unnecessary burden on the government. Probable-cause warrants would only get in the government's way.
Update: Declan McCullagh points out that in 2008, candidate Obama took the opposite position as now-President Obama. (Via Doug Mataconis.)