Vice President Al Gore defeated Bill Bradley in Georgia and battled him in Super Tuesday primaries from Maine to California, pushing his rival to the brink of withdrawal in the Democratic presidential race.

The exit polls foretold Gore's win in Georgia, and pointed to a close race in Vermont. The two states were the leading edge of the nominating campaign, primaries and caucuses in 15 states and American Samoa in a virtual nationwide primary.

Polling place interviews with voters in every region of the country pointed to a strong showing for the vice president among core constituencies vital in Democratic primaries.

Blacks and Hispanics preferred Gore over Bradley by a margin of 8-1; the margin among union members was smaller, but a healthy 3-1. Bradley fared better among independents.