The National Education Association completed its interviews of the Democratic presidential candidates yesterday and will send video tapes of the sessions and copies of the candidate questionnaires to its state affiliates next week in its process of deciding whether to endorse a candidate in 1988 as it did Walter F. Mondale in 1984.

Like the AFL-CIO, the independent NEA now appears to be too divided for one candidate to get the 58 percent approval of the NEA-PAC council and the board of directors required for a late-1987 endorsement.

"The feeling now is toward a possible multiple endorsement, of maybe two or three candidates," said NEA political director Ken Melley. Another possibility is a delayed endorsement between the "Super Tuesday" primary on March 8 and the April 26 Pennsylvania primary after the field has been narrowed, Melley said.

All seven Democratic candidates were interviewed by NEA President Mary Hatwood Futrell and responded to the questionnaire, but the Republicans were less forthcoming. Only former senator Paul Laxalt (Nev.), who dropped out of the race last week, did both the interview and the questionnaire. Senate Minority Leader Robert J. Dole (Kan.) completed the interview and Rep. Jack Kemp (N.Y.) may do the interview, Melley said.

One reason for the Republicans' reluctance is that the NEA has endorsed only Democrats since it began the process in 1976.

"We're a bipartisan group," Melley said. "About 600,000 of our 1.8 million members are Republican . . . . Our members can help candidates of both parties and we're aiming to have at least 100 delegates to the Republican convention {of about 2,200}."