The 2008 Pennsylvania Primary was held on April 22, 2008. 158 delegates, plus 30 Superdelegates to be allocated at the 2008 Democratic Convention, were at stake for the Democratic Party, and 74 for the Republicans.

On the Democratic side, the popular vote went, as expected, to Clinton, with 55% to Obama's 45%. Her win will result in a gain of at least 80 delegates, with Obama picking up at least 66. As of April 23, 12 delegates remain unpledged. Clinton's Pennsylvania gain will make little mathematical difference going into the 2008 Indiana Primary, since Obama leads decisively in both the popular vote and the delegate count (with roughly 1714 delegates to Clinton's 1589). However, the contest at the 2008 Democratic Convention, set for St. Paul, Minnesota on August 25, may be decided by unpledged superdelegates, among whom Clinton has an early but uncertain lead.

The Republican primary in Pennsylvania was a formality: According to the Republicans' winner-take-all primary system, John McCain has already taken the GOP nomination. Libertarian candidate Ron Paul nonetheless picked up 16% of the vote, while Mike Huckabee, a favorite among evangelical voters, picked up 11%.

1. Polls open: 7 AM - 8 PM EST
2. Closed primary
3. John McCain has already clinched the Republican nomination
4. Democratic delegates will be divided based on popular vote between Barack Obama and Hillary Clinton
5. Republican winner: John McCain
6. Democratic winner: Hillary Rodham Clinton

• Wall Street Journal: Clinton Defeats Obama In Pennsylvania Primary (April 23, 2008)

• FOX News: Clinton Projected Winner of Pa. Democratic Primary (April 22, 2008)

• ABC News: Dems Fight On; Hillary Clinton Wins Pennsylvania Primary (April 22, 2008)

• CNN: Clinton wins Pennsylvania, CNN projects (April 22, 2008)

• Associated Press (Breitbart): Analysis: Pennsylvania is must-win for Clinton

• ABC News: Polls Closed in Pennsylvania; Pressure is on Clinton to Win Big (April 22, 2008)

• Google News: 2008 Pennsylvania Primary

• Telegraph.co.uk: Pennsylvania exit poll results (April 22, 2008)

• The New York Times: What to Watch When You Are Watching the Pa. Returns (April 2, 2008)

• NPR: Pa. Vote Could Be Do or Die for Clinton (April 2, 2008)

• MSNBC: Primary voters size up Obama and Clinton (April 22, 2008)

• WashingtonPost.com: In Parts of Pa., Racial Divide Colors Election (March 23, 2008)

• ComputerWorld: Pennsylvania pulls plug on voter site after data leak (March 19, 2008)

• MTV News: What Do Obama, Clinton Need To Do To Win In Pennsylvania? (March 18, 2008)

• The Numbers Guy (WSJ): Pennsylvania's Missed Opportunity (March 5, 2008)

• The Sentinel: Fluid races could make Pa.'s late primary important (January 12, 2008)

• Pennsyltucky Politics: Clinton wins Pennsylvania straw poll (January 12, 2008)