CAMPAIGN : Next Up: Pennsylvania

Barely a month ago, Arkansas Gov. Bill Clinton appeared to have the Democratic presidential nomination within his grasp, only to suffer a surprise loss to former California Gov. Edmund G. (Jerry) Brown Jr. in Connecticut. Today’s Pennsylvania primary offers Clinton the chance to show he can build upon his recent primary victories in New York and three other states, rather than stumble.

Democrats: With Pennsylvania polls showing him comfortably ahead of Brown, Clinton ran an above-the-fray campaign in which he tested and refined the message he hopes to use in the fall. He stressed economic policies aimed at helping the middle class and intensified his attacks on President Bush. Brown initially cooperated with Clinton’s strategy by scaling back his criticism of his foe. But as today’s vote neared, Brown returned to the offensive, blasting Clinton as a tool of the political status quo and questioning his chances in November. Still, Clinton may benefit from what one observer termed “scandal-fatigue” among Democratic voters; many seem inclined to focus on his plans for the future instead of his actions in the past.

Republicans: Challenger Patrick J. Buchanan is on the ballot, but he has campaigned little in the state.

Defining the Territory

* Population: 11,881,643

Whites: 88.5%

Black: 9.2

Asian: 1.2

Other: 1.0

Latino population, at 2%, is recorded under either black or white

Pennsylvania U.S. Unemployment rate 7.2% 7.3% Per capita income $18,672 $18,685 High School graduates 76.8% 71.2% College graduates 18.6% 21.1%

Delegates at Stake

* Democrats: 169

* GOP: 91

Poll Data

* Registered voters: 5,659,189

* Polling hours: 7 a.m. to 8 p.m.

* System: A closed primary. Only registered Democrats can vote for Democratic candidates and registered Republicans vote for Republicans.

Democrats (2,145 needed for nomination):

Bill Clinton: 1,387

* Paul E. Tsongas: 529

Jerry Brown: 271

Uncommitted: 569

* Tsongas has suspended his campaign. His delegates are committed until the convention, at which time they may be available to other candidates.

Republicans (1,105 needed for nomination):

George Bush: 1,020

Patrick Buchanan

Uncommitted: 2

The Contests to Come

Delegates Today Pennsylvania Primary D 169 R 91 May 1 Maine Caucus -- R 22 Wyoming Caucus -- R 12 May 3 Guam Caucus D 3 R 4 May 5 D.C. Primary D 17 R 14 Indiana Primary D 77 R 51 North Carolina Primary D 84 R 57 May 9 Delaware Caucus -- R 19 May 12 Nebraska Primary D 25 R 24 West Virginia Primary D 31 R 18 May 16 Missouri Caucus -- R 47 May 19 Oregon Primary D 47 R 23 Washington Primary -- R 35 May 26 Arkansas Primary D 36 R 27 Kentucky Primary D 52 R 35 Idaho Primary -- R 22 June 2 Alabama Primary D 55 R 38 California Primary D 348 R 201 Montana Primary D 16 R 20 New Jersey Primary D 105 R 60 New Mexico Primary D 25 R 25 Ohio Primary D 151 R 83 June 9 North Dakota Primary -- R 17 June 13 Iowa Caucus -- R 23 Utah Caucus -- R 27

The Conventions

Democrats: July 13-16

Republicans: Aug. 17-20