Casey v. Santorum is an example. Casey's old man was as pro life as they come, but he was denied the opportunity to speak at the last convention he attended before his death.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus
Casey picked up some Pro Life votes from Santorum this election. Santorem backed Spector and also had a problem with stem cell research.