Maryland Del. Juanita D. Miller, who was unexpectedly dropped a few weeks ago from the 25th District's Democratic Party slate, says she will challenge state Sen. Albert R. Wynn in the September Democratic primary.

Miller said she intends to run an "issue-oriented" campaign and declined to discuss her disagreements with Wynn, who recently withdrew his support of Miller and endorsed two newcomers for delegate seats in the district.

"I do not intend to get into personalities," said Miller, a teacher first elected to the House of Delegates in 1987. "I think I can bring the kind of leadership this district needs." Miller is the first Democratic opponent to emerge against Wynn, a former delegate who was elected to the Senate in 1987.

Wynn said he dropped Miller from his slate because of "philosophical differences." He said he wanted "team players" in the delegation who would work for common causes.

Wynn has given his support to incumbent Ulysses Currie and newcomers Michael Arrington and Beatrice Tignor.

Arrington is a community activist who played a prominent role in the protest over an ill-fated attempt by Prince George's County Executive Parris Glendening to extend the contract of School Superintendent John A. Murphy. Tignor is a professor at Prince George's Community College.