The supporting actor category could be filled with the actors from “Lincoln”; character greats like David Strathairn, James Spader, Tim Blake Nelson, and John Hawkes drop by for Steven Spielberg’s epic. But it’s Jones as antislavery lawmaker Thaddeus Stevens who steals every scene he’s in. Whether bellowing in the courtroom or taking jabs at his fellow politicians, Jones manages to do the virtually impossible: make politics entertaining.