Senator John McCain calls himself a “Teddy Roosevelt Republican,” and both Rudolph W. Giuliani and Mitt Romney, the other perceived frontrunners for the G.O.P. nod, have tried to tie themselves to Ronald Reagan.

Sam BrownbackSam Brownback (Photo: Charlie Riedel/Associated Press)

But the latest comparison might be a bit of a head-scratcher for most, especially those who don’t identify as evangelicals.

Senator Sam Brownback: William Wilberforce Republican.

If you don’t know who he is, never fear—Hollywood is coming to the rescue with Friday’s release of  “Amazing Grace.” The film details Mr. Wilberforce’s successful, 20-year effort as a British member of parliament to abolish the slave trade in the British Empire. He was inspired by his evangelical Christian beliefs. And Mr. Brownback, a devout Catholic who was previously an evangelical Protestant, “is deeply inspired by William Wilberforce,” said Brian Hart, his campaign spokesman.

A March 2006 article in The Economist first named Mr. Brownback a “Wilberforce Republican,” referring to his faith-grounded efforts to end human trafficking, fight genocide and AIDS in Africa and to reform prisons.

The Kansas senator is running with the association. Last Thursday, he introduced a bill to honor the British abolitionist, and on Friday, he’ll participate in a panel discussion following a screening of “Amazing Grace” in Los Angeles.

“We must continue to follow Wilberforce’s example and fight for the dignity and freedom of every person,” Mr. Brownback said in a press release about the bill. “It is intolerable that 200 years after Britain banned its slave trade, there are still hundreds of thousands of victims of human trafficking who are used as bonded labors, sex slaves, and in other horrifying capacities.”

“This will help him in the sense that Senator Brownback comes across as this sweet gentleman, but here he is saying forthrightly, ‘I am a conservative on many issues, but I’m also for the downtrodden and the oppressed,’” said Michael Cromartie, vice president of the Ethics and Public Policy Center, a Washington think tank. “Claiming the mantle of Wilberforce this early on and around the time of this movie is all to the good, and now the others who are doing it will be following him.”

Other social conservatives, such as Mike Huckabee, the former Arkansas governor, wouldn’t be the only ones to potentially follow Mr. Brownback. Mr. Wilberforce is familiar to evangelicals (i.e. Republican voters in the Iowa caucuses and South Carolina primary) because people like Charles Colson and James Dobson mention him on their radio shows, said Mr. Cromartie. But he’s also “invoked all the time” at Capitol Hill prayer meetings attended by a diverse group that includes Mr. Brownback and Senator Hillary Rodham Clinton. Plus, as an abolitionist, Mr. Wilberforce would have appeal to potential supporters of the Democratic candidates as well.

“I see him as somebody who could be claimed by anybody but someone with business interests,” said Mr. Cromartie, because big British business wanted to keep the slave trade alive. Indeed, sponsors of “Amazing Grace” include Mr. Dobson’s Focus on the Family, Sojourners, a liberal evangelical group, and Wilberforce University, a predominantly black school in Wilberforce, Ohio.

Joseph Loconte, a senior fellow at E.P.P.C. who wrote an op-ed in Wednesday’s Los Angeles Times calling for contemporary politicians to follow Mr. Wilberforce’s example with a faith-based approach to human rights, wrote in an email to The Times that it is fair to call Mr. Brownback a “conviction politician” in the Wilberforce vein.

But, he continued, it won’t necessarily help him in his presidential bid:

Americans don’t normally vote for a presidential candidate because they want a great social reformer (think about the failed presidential bids of Democratic contender William Jennings Bryan). In post-9/11 America, they probably want a leader who understands the deepest threats to our national security–the existential threat of radical Islam, for example–and what to do about them. Anyone seeking the presidency now is going to have to persuade Americans that he, or she, is the best person to take on this task.