PHILADELPHIA — They don’t want to “defund the police,” but they do want to end the Senate filibuster. Those were some of the positions taken Monday by the four Democrats seeking the party’s nomination for Pennsylvania’s open U.S. Senate seat. The candidates — Lt. Gov. John Fetterman, U.S. Rep. Conor Lamb, State Rep. Malcolm Kenyatta, and Jenkintown Borough Council member Alexandria Khalil — also supported continuing American military aid to Ukraine as it fights off Russia’s invasion. But they each said no to sending American forces to that battlefront. And they agreed that keeping Roe v. Wade’…