The office of Rep. Howard C. Nielson, R-Utah, has issued a press release maintaining the Democratic majority in Congress is at least as guilty of the so-called sleaze factor in government as the Republicans they accuse.

The rambling 31/2-page release titled "Please Pass the Sleaze" issued earlier this week said Speaker of the House Jim Wright, D-Texas, has a convicted felon working as an aide and that Wright's press secretary has "authored a sex book digest."Whether partisan scribes and legislators wish to admit it or not, there is plenty of sleaze to go around," the release said.

Nielson is being opposed by two Democrats in his bid for re-election this year to a fourth term representing Utah's 3rd Congressional District.

The release defends former presidential aides Michael Deaver, Lyn Nofziger and Oliver North, as well as Attorney General Edwin Meese, saying all were "pilloried" and the victims of "vitriolic attacks" by the "liberal press."

"Sleaze is largely in the eye of the beholder," the release said.

The House Committee on Standards of Official Conduct, often called the ethics committee, recently had 14 House members - all Democrats - under investigation, the release said.

Now there are calls for the committee to investigate Wright for a possible conflict of interest in a book-publishing deal he arranged that could be used to hide campaign contributions, it said.

The House Democratic leadership has manipulated votes and congressional voting district lines have been gerrymandered to the Democrats' advantage, a practice that has gained the majority party 23 seats, the release claimed.

"After 30 years' majority rule by one party, power has been used more and more abusively. Reversing the roles of the pres-ent majority and minority parties could provide the necessary catharsis," it said.

The release urged House Democrats to choose new leadership with a sense of fairness and advocated legislation to apply the special prosecutor law to the speaker of the house and to reduce gerrymandering.

It encouraged voters to write and phone their congressional representatives, to follow issues and to vote.