5 stories to follow: May 20

State treasurer Rob McCord, from left, and former state environmental protection secretary Katie McGinty laugh as U.S. Rep. Allyson Schwartz and businessman Tom Wolf wait for the start of a Pennsylvania Democratic Gubernatorial Primary Debate, Thursday, May 8, 2014, in Philadelphia. (AP Photo/Matt Slocum)

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

1. Primary day: It's primary day in Pennsylvania, and voters are heading to the polls to choose party nominees for governor, Congressional representatives, state legislatures and other positions. Polls are open from 7 a.m. to 8 p.m.

2. Same-sex marriage ruling?: The American Civil Liberties Union says it expects a federal judge to issue a ruling today in the group's challenge to Pennsylvania's law barring same-sex marriage.

3. Mob trial: Defense attorneys for Anthony Nicodemo are slated to begin presenting their case today in the reputed mob soldier's murder trial. Nicodemo is accused of fatally shooting Gino DiPietro in South Philadelphia in December 2012.

4. Bridge testimony: Matt Mowers, a former aide to New Jersey Gov. Chris Christie, is scheduled to testify today at a legislative hearing about the George Washington Bridge lane closures. Some Republican lawmakers, however, are saying hearings should be suspended while federal prosecutors probe the incident and legislators should instead concentrate on reforming the Port Authority of New York and New Jersey.

5. NBA lottery: Tonight is the NBA draft lottery, where the Sixers will learn where they will learn their draw for the June draft. The team could end up with two picks in the top 10.