The polls are now closed in Pennsylvania, Get live results here.

Tuesday’s Pennsylvania primaries are the opening act in a drama that Democrats nationally are eagerly watching: Who will win under new congressional maps that undo a Republican gerrymander?

In January, the State Supreme Court redrew the boundaries of the state’s 18 districts to create a more politically level playing field. Analysts predict that as a result Democrats will probably gain three to six seats — a sweet down payment on their goal of taking control of the House of Representatives in November.

Most of the potential Democratic pickups are in the Philadelphia suburbs, and three are all but gimmes in the general election. That doesn’t mean there won’t be drama on Tuesday: In the Fifth District, centered on Delaware County, 10 Democrats, most unknown to voters, are seeking the nomination. It’s been called a “clown car primary” and is sure to confuse voters.