Santorum was effectively returning a favor by endorsing Specter despite his aggressive pro-abortion-rights views. Specter had supported Santorum’s 1994 Senate campaign.
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Santorum didn’t become pro-life until 88? 89? I believe he said. I guess he didn’t become strongly pro-life until even later?
I think you could be moderately pro-life and have difficulty supporting a candidate, like Specter, who "believed that anti-abortion activists were a “fringe” group hijacking the Republican party."