5 stories to follow: May 15

Isabelle Barker, left, and Cara Palladino, right, show off their wedding rings they exchanged when they were legally married in the State of Massachusetts. Two Pennsylvania women have filed a federal lawsuit seeking national recognition of same-sex marriage. Though married in Massachusetts, Cara Palladino and Isabelle Barker say their status is not recognized in Pennsylvania, where they now live with a four-year-old son. Marriages of same-sex couples in 13 states and the District of Columbia are not recognized in the other 37 states. The suit seeks to change this. 09/26/ 2013 ( MICHAEL BRYANT / Staff Photographer )

Here's your daily look at five stories we're following:

1. Same-sex marriage suit: A federal judge in Philadelphia will hear oral arguments today in a suit brought by a lesbian couple who married in Massachusetts and want their nuptials recognized in Pennsylvania. The lawsuit is one of at least five challenges to parts of the state's ban on same-sex marriage.

2. Convention Center work rules: Today is the first big test for the Pennsylvania Convention Center's new labor agreement, as the BIO World Congress of INdustrial Biotechnology is wrapping up its three-day conference. The four unions that signed on to the new work rules  -- rather than the usual six that worked at the center -- will dismantle the exhibits.

3. WCU graduation: A second graduation ceremony will take place today for West Chester University students who could not walk across the stage when Saturday's commencement was rained out.

4. Net neutrality: Federal Communications Commission Chairman Tom Wheeler is expected to announce a proposal today that would let network owners charge companies extra for a speedier Internet "fast lane." 

5. N.J. mayor's sentencing: Former Trenton Mayor Tony Mack is scheduled to be sentenced for bribery, fraud and extortion today in federal court.