By Sam Baker - 10/01/13 05:26 PM EDT
The traffic "exceeds anything that we had expected," Obama said.
Obama has repeatedly predicted glitches in the exchanges' rollout, but Republicans argued Tuesday that the widespread outages are a sign the law is unworkable.
In addition to the heavy traffic on healthcare.gov, state exchanges said they had been overwhelmed during their initial launches. New York reported receiving 2 million hits in two hours, and Kentucky said its exchange had logged 24,000 visitors by 9:30 a.m.