HARRISBURG — Housekeeping changes at the Democratic National Committee have resulted in the reassignment of one of Pennsylvania's superdelegates to the 2008 presidential nominating convention.

Anna Burger, secretary-treasurer of the Service Employees International Union, has switched her voter registration from Pennsylvania to the District of Columbia. As an at-large member of the national committee, Burger retains her status as a superdelegate but is now counted as part of the D.C. delegation, state party officials said.

That reduces the number of Pennsylvania superdelegates from 30 to 29, and the state's total delegate slots at the August convention in Denver from 188 to 187.

Mary Isenhour, executive director of the state Democratic Party, noted that the Pennsylvania delegation remains one of the largest.

Nationally, there are roughly 800 Democratic superdelegates — elected officials and party leaders chosen outside the primaries and caucuses and not bound to support a particular candidate. Their votes are considered potentially decisive in this year's tight nomination battle between Sens. Hillary Rodham Clinton of New York and Barack Obama of Illinois.

As of Feb. 8, among the 26 Pennsylvania superdelegates named so far, 13 said they supported Clinton, two backed Obama and 10 were undecided. The other one, former Pittsburgh Mayor Sophie Masloff, abandoned her earlier support for Clinton and now says she is uncommitted.

The Democratic State Committee will pick the remaining three superdelegates in June.

The 158 pledged delegates who will make up the lion's share of Pennsylvania's delegation will be elected by party members in the state's April 22 primary or selected by the state committee in June in proportion to the statewide presidential preference.