Stupak-Pitts isn’t just “the biggest restriction on women’s right to choose in our generation,” as Rep. Diana DeGette of Colorado puts it; it’s also evidence that on abortion the Democratic Party is now captive, just like the GOP, to Christian conservatism. Of course, Republicans traded away their party’s moderate wing for real electoral gains, a base that propelled them to power for decades. The Democrats, already in power, sucker-punched themselves, and all they have to show for it is a big fat shiner in the shape of Bart Stupak’s knuckles.

But if Stupak, a former state trooper from Michigan, provided the muscle, his partner, Joe Pitts — a Pennsylvania Republican with decades in the trenches of the antiabortion battle — may have brought the brains, and more, a new Christian right coalition custom tailored for the Democratic Party’s growing religious conservatism. Stupak is Roman Catholic; Pitts is evangelical. Both are members of the predominantly evangelical organization called the Family; Stupak lives in its C Street house. Together, they’re poster boys for the evangelical/conservative Catholic alliance known as “co-belligerency,” a culture war strategy designed to take territory within the Democratic Party as well the GOP.

Stupak, the Democratic co-chair of the House Pro-Life Caucus, insists that his amendment does nothing more than ensure that the 1976 Hyde Amendment, which forbids the use of federal funds for abortions, is carried over into healthcare reform. Even some of Stupak’s angriest critics within the party concede that Stupak might actually believe that — nobody has ever accused him of being a subtle legislator. (Though Stupak himself, long known for his amiability, now boasts that he was hiding his “wolfiness” all along.) But the facts are plain: Stupak-Pitts will use the Hyde Amendment as a lever with which to radically roll back abortion rights, effectively strong-arming private insurers — most of which will be enmeshed with the federal government now — into abandoning coverage for abortions.

Much is being made in the media about the role played by the U.S. Council of Catholic Bishops, which lobbied hard for the amendment. “We just have to accept this as a Catholic thing,” goes the new conventional wisdom. Leaving aside the fact that a strong majority of American Catholics are pro-choice, that story line obscures the increasingly significant role played by evangelical conservatives within the Democratic Party.

Start with Stupak and Pitts themselves. Although Stupak is a Catholic, he’s lived since at least 2002 in the C Street house run by the Family, which cultivates political leaders on behalf of a long-term vision of what Joe Pitts, speaking at last year’s National Prayer Breakfast (the group’s only public event), called “God-led government.” After the summer sex scandals of Sen. John Ensign, Gov. Mark Sanford and former Rep. Chip Pickering, C Streeters all, made the Capitol Hill address infamous, Stupak denied any knowledge about the house he lives in. “I don’t know what you’re talking about,” Stupak told Michigan reporters when asked about his residence in the house, where he’s been enjoying below-market rent for the last seven years, courtesy of C Street’s tax-exempt status as a church. But when the Los Angeles Times asked Stupak about his role there in 2002, he pleaded secrecy instead of ignorance: “We sort of don’t talk to the press about the house.”

That’s putting it mildly. In its internal documents, the Family refers to itself as an “invisible organization” and the “prayer cells” into which it organizes politicians as “invisible ‘believing groups.'” That doesn’t make it a conspiracy. Rather, the Family represents the soft-sell side of conservative evangelicalism, a social movement that goes beyond — or maybe beneath — pulpit pounding and political purity in pursuit of ideological influence on both sides of the aisle. Longtime Family leader Doug Coe, dubbed the “stealth persuader” on Time magazine’s list of the 25 most influential evangelicals, declares in a sermon delivered to evangelical leaders that “the more invisible you can make your organization, the more influence it will have.”

Joe Pitts can testify to that. It’s a safe bet that until Stupak-Pitts, few Americans beyond Pennsylvania Amish country had even heard of the avuncular Republican, a former gym teacher who rarely attaches his name to legislation. And yet he’s been a driving force in the antiabortion fight for more than three decades. It was Pitts, a “core” member of the Family, who helped bring antiabortion politics into the organization back in the early 1980s. The Family’s focus has always tended toward foreign affairs and economics; Pitts merged the two with the red-hot politics of the abortion wars, quietly exporting free-market fundamentalism and draconian social policy overseas. Pitts and Stupak have joined forces on that front before, teaming up to try to turn President Bush’s underfunded but laudable President’s Emergency Relief for AIDS initiative into an antiabortion crusade. What they couldn’t achieve abroad, they’ve now brought back home, and then some.