Vice President Cheney’s rating with the American public is virtually unchanged since the end of February. The latest polling by the University of Pennsylvania’s National Annenberg Election Survey, among 2,575 adults between March 1 and 15, shows that 35 percent of the public has a favorable opinion of him and 34 percent an unfavorable view. With a margin of sampling error of plus or minus two percentage points, these results are statistically indistinguishable from the February 16-29 findings of 33 percent favorable and 36 percent unfavorable. Nor was there any significant change in the opinion of Republican primary voters about whether President Bush should keep him on the ticket. Sixty-four percent said he should be kept, and 28 percent said he should be replaced.