He brought it up once months ago in an interview with a little known faith based blogger in Iowa.
That hardly qualifies as making it "his main issue."
But its the kind of issue that will be latched onto and blown out of proportion by the media and the other democratic sycophants.
Santorum needs to be careful and redirect these questions back to issues on energy, immigration, economy, entitlement elimination/reform, shrinking the size of the government, balancing the budget, and national defense.