One that the late Governor Casey knew too well. More from that Times piece:

Mr. Stupak says his stand is a straightforward matter of Roman Catholic faith, but it also seems like the result of a long, slow burn. As dinner progressed, the congressman described years of feeling ignored, slighted or marginalized by his party for his anti-abortion views.
“We’re members without a party,” he said. “Democrats are mad at you, and Republicans don’t trust you.”