Muzzio said that 23 percent of Dukakis' primary voters were Democrats who cast ballots for Reagan in 1984.

The popular vote totals on the Democratic side looked like this:

In Nebraska, with 56 percent of the precincts counted, Dukakis had 45,712 or 65 percent, to 17,448 or 25 percent for Jackson.

In West Virginia, with 15 percent of the precincts reporting, Dukakis had 29,363 or 80 percent, to Jackson's 5,005 or 14 percent.

Inthe GOP Nebraska primary Bush had 53,470 or 73 percent to Dole's 16,106 or 22 percent. Inactive candidate Pat Robertson had 3466 or 5 percent.

In West Virginia, Bush had 10,537 for 89 percent of the vote.

The night's returns left the Massachusetts governor with 1540 delegates, to 942 for Jackson. It takes 2081 to claim the nomination.

The week's Democratic primaries offered a breather in the schedule after a rapid-fire series of industrial state contests ending last week in Indiana and Ohio and pointing the way toward contests in Oregon next week and California in early June.

Neither Democratic contender spent much time or devoted much advertising money to Nebraska and West Virginia--and their campaigns were overshadowed by fierce gubernatorial and senatorial primaries.

Neither Dukakis nor Jackson seemed to mind that the presidential race was at a pause. The Massachusetts governor, the nomination seemingly within his grasp, took a weekend off for the first time in months.

Jackson devoted part of his week to campaigning in California, where he plans a costly and intensive effort to slow Dukakis' drive toward the nomination.

Frank E. Lockwood contributed to the reporting of this story.