Republican presidential candidates, from left, former Arkansas Gov. Mike Huckabee, Sen. Marco Rubio, R-Fla., former Pennsylvania Sen. Rick Santorum and Carly Fiorina bow their heads in prayer at the end of the Presidential Family Forum, Friday, Nov. 20, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

Some were taken by surprise when former Pennsylvania senator Rick Santorum endorsed his former opponent Marco Rubio as soon as he dropped out of the Republican presidential race on Wednesday. But it shouldn’t come as a shock that the conservative true believer, notorious for his anti-gay and anti-abortion crusades, would back the supposedly “mainstream” Florida senator.

While the press likes to portray Santorum as a kooky culture warrior and Rubio as an establishment square, the two hold many of the exact same positions.

The similarities start with their dangerous views on abortion rights. Rubio wants to ban all abortions with no exceptions even for survivors of rape and incest or for women with life-endangering pregnancies. In the very first 2016 Republican presidential debate, Rubio went so far as to suggest that the U.S. Constitution may already ban abortion. Rubio has hailed anti-abortion activists as similar to those who fought for the abolition of slavery, women’s suffrage and civil rights for African Americans and has pledged to “immediately” re-impose the Mexico City Policy, which would block crucial funding to women’s health groups outside of the U.S. A vocal critic of Planned Parenthood, Rubio once made the absurd claim that women at Planned Parenthood clinics are “pushed into abortions so that those tissues can be harvested and sold for a profit.”

He told one conservative pundit that because “there is no way that you can read that Constitution and deduce from it that there is constitutional right to an abortion,” he would only appoint Supreme Court justices who see Roe v. Wade as a “flawed” decision.

The Florida senator is aggressively courting the Religious Right, which should come as no surprise since his stances on social issues are barely distinguishable from Santorum’s.

Rubio joined Santorum and four other Republican presidential candidates in pledging to sign legislation making it legal to discriminate against same-sex couples. He even implied his support for Kentucky clerk Kim Davis, who attempted to use her county office to deny marriage licenses to same-sex couples, by claiming that people can and should “ignore” laws or court rulings that do not “adhere to God’s rules” because “God’s rules always win.” “We cannot abide by that because government is compelling us to sin,” he said.

Rubio has called same-sex marriage “a real and present danger” to freedom and religion, arguing that only someone who has a “ridiculous and absurd reading of the U.S. Constitution” would agree with the Supreme Court’s landmark marriage equality decision and promising that his nominees to the Supreme Court would disagree with the ruling.

The potential for a President Rubio to be nominating the next few Supreme Court justices could prove especially frightening seeing that the senator, in an address to a far-right Florida group, rejected the separation of church and state as unconstitutional.

He has also embraced the Right’s phony religious persecution rhetoric, running campaign ads and delivering speeches about how conservative Christians like himself who oppose gay marriage are the real victims of discrimination in America. During Saturday’s debate, he said that Christians in America face far more discrimination than Muslim-Americans.

On the economy, Rubio might even be furtherto the right of many in the GOP. For starters, as New York Times reporter Josh Barrow explained, Rubio “would impose no tax at all on interest, dividends or capital gain income from stocks” as part of a larger tax-slashing regimen that Barro called “a big tax cut for people who are already doing well.” Think of it as the Bush tax cuts on steroids: disproportionate government aid to the ones who need it the least that costs the government trillions of dollars in revenue.

Rubio, who was first elected to the Senate as a Tea Party favorite, has also vowed to repeal Wall Street reform and oppose any increase in the minimum wage, and has adopted a “do-nothing” and denialist approach to climate change.

Despite this record, the media has given Rubio flattering coverage, portraying him as a mainstream candidate who can thwart radicals like Donald Trump and Ted Cruz. Part of Rubio’s reputation as somehow more “moderate” or “mainstream” comes from his previous support for a bipartisan immigration reform bill. But of course Rubio ended up renouncing the bill and tacking further to the right on immigration than many of his Republican colleagues.

Even though Santorum, when asked last week, couldn’t name a single legislative accomplishment of Rubio’s, it is obvious that Rubio has succeeded in doing at least one thing: embracing the ideology of the GOP’s extremist wing without being held accountable for it.