 After a challenging week for the legislative body, the approval rating of the United States Congress has shrunk to a point where it is no longer detectable by the technology currently available, a leading pollster said on Friday. Davis Logsdon, who heads the highly regarded Opinion Research Institute at the University of Minnesota, said that his polling unit has developed highly sensitive measurement technology in recent years to gauge Congresss popularity as it fell into the single digits, but added that as of this week, Congress is basically flatlining. At the beginning of the week, you could still see a slight flicker of approval for Congress, he said. Thenbam!the lights went out. Logsdon said, however, that people should resist drawing the conclusion that Congresss approval rating now stands at zero. They may have support in the range of .0001 per cent or, say, .0000001 per cent, he said. Our equipment just isnt advanced enough to measure it. Logsdon said that the swift descent of Congresss approval rating below detectable levels has surprised experts in the polling profession. A couple of years ago, when they shut down the government, I wondered, What could they possibly do to become less popular than this? the pollster said. Now we know. 