Congress made a wider left-hand turn last year, posting its highest liberal scores in years and rejecting policies of a conservative lame-duck president, the Americans for Democratic Action said yesterday.

"The pendulum has surely swung back our way," said Marc Pearl, executive director of the liberal organization that annually evaluates voting on foreign, military, social and domestic policy issues.

The ADA's subjective analysis of 20 Senate and 25 House votes showed both chambers posting averages of more than 50 percent, meaning each supported ADA positions more than half the time.

Democrats in both chambers had collective scores of 76 last year. House Republicans scored 25, up from 21 in 1986. Senate Republicans scored 15, up one point.

Both chambers last year had more members scoring an ADA-perfect 100 and fewer at zero. Only Democrats had 100s and only Republicans had zeroes.

Four senators, one more than in 1986, had 100s last year. Five, down from 15 in 1986, had zeroes. In the House, 19 members had ADA scores of 100, a gain of six. Twenty-four scored zero, down from 46 in 1986.

The Senate had an overall score of 52.5 last year, up from 44 in 1986 and 40 in 1981. The House average last year was 51, compared with 46 in 1986 and 40 in 1981.

Here are local members' scores:

Maryland, Senate: Democrats -- Barbara A. Mikulski, 100; Paul S. Sarbanes, 100.

Maryland, House: Democrats -- Beverly B. Byron, 52; Benjamin L. Cardin, 88; Roy Dyson, 44; Steny H. Hoyer, 84; C. Thomas McMillen, 80; Kweisi Mfume, 100. Republicans -- Helen Delich Bentley, 28; Constance A. Morella, 60.

Virginia, Senate: Republicans -- Paul S. Trible Jr., 15; John W. Warner, 25.

Virginia, House: Democrats -- Frederick C. Boucher, 76; James R. Olin, 64; Owen B. Pickett, 72; Norman Sisisky, 52. Republicans -- Herbert H. Bateman, 12; Thomas J. Bliley Jr., 0; Stan Parris, 8; D. French Slaughter Jr., 0; Frank R. Wolf, 12.