With President Clinton scheduled to testify before a federal grand jury in less than two weeks and the FBI laboratory examining Monica Lewinsky's cocktail dress for a semen stain, the next few weeks should be volatile ones for public opinion. Taking a look at the numbers today provides a useful benchmark with which to compare before-and-after attitudes.

The president's job approval ratings remain high. The July 25- 27 NBC News/Wall Street Journal poll of 1,006 adults taken by Robert Teeter and Peter Hart pegged the president's job rating at 64 percent, with a 30 percent disapproval. A CBS News poll taken July 28-29 of 988 adults indicated 61 percent approve of the president's performance while 30 percent do not. A July 29 Gallup poll of 622 adults for CNN and USA Today, taken just after news that Lewinsky and Clinton would testify, put the president's approval at 65 percent with a disapproval of 31 percent. That same night, Hart and Teeter went back into the field with 501 adults, finding a 68 percent approval rating. Taken together, Clinton's job approval

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