President Obama’s effort to accommodate the Catholic Church by altering his administration’s rule on birth control coverage. Their continued anger over a requirement that nearly all employers offer free insurance coverage for contraception — even with changes Obama announced Friday for faith-based institutions that object on religious grounds — guarantees that the issue will percolate throughout the presidential election season.

Anthony Picarello, general counsel for the U.S. Conference of Catholic Bishops, summed it up this way: “It’s the unstoppable force meets the immovable object.”