Patrick Prendergast, the young mad Irish immigrant, took pride in Harrison’s renewed popularity and believed his own efforts at promoting the ex-mayor for reeelection had had a lot to with the campaign’s new momentum. An idea came to Prendergast. Just when it entered his brain he could not say, but it was there, and it gave him satisfaction. He had read extensively into law and politics and understood that political machines operated on a first principle of power: If you worked to advance the interests of the machine, the machine paid you back. Harrison was in his debt.