Pennsylvania was central to much of the post-election litigation that ex-President Donald Trump and his allies used to challenge the results of the contentious 2020 election. And now the Keystone state once again finds itself in the middle of a contentious fight of national significance - this time whether the former president should be barred from holding future office for his alleged role in stoking the deadly Jan. 6 attack on the Capitol. With the proceedings now underway, take a look at the four Pennsylvania lawyers who are litigating on both sides of the historic impeachment.