In 2008 the U.S. Chamber of Commerce supported TARP, the $800 billion Wall Street bailout. Early in 2009 the Chamber supported President Obama’s $800 billion “stimulus” bill. Then four months later it announced its creation of the “Campaign for Free Enterprise.” As I pointed out at the time, it would have been nice if the Chamber had discovered the virtues of free enterprise when it mattered.

Now the Chamber’s got a new campaign that seems incongruous for a “free enterprise” organization. It has endorsed the primary opponent of Rep. Justin Amash (R‑MI), the most pro-free-enterprise and most libertarian member of Congress. You don’t have to take my word for that. The Club for Growth rates Amash 100 percent. The National Taxpayers Union rates him second among 435 members of Congress in fiscal conservatism. He scored 100 percent on the Freedomworks Scorecard.

So why would the Chamber of Commerce oppose him? I looked at big business opposition to Amash and several other libertarian-leaning legislators last month:

In Michigan business leaders are funding financial consultant Brian Ellis’s primary challenge to Rep. Justin Amash. Since his election in the 2010 tea party wave, Amash has emerged as the most libertarian member of the House of Representatives. He’s second to McClintock on the National Taxpayers Union spending-vote ratings. He organized a bipartisan effort to rein in the National Security Agency that came within a few votes of passing the House. He heads the House Liberty Caucus. Amash told the New York Times, “I follow a set of principles, I follow the Constitution. And that’s what I base my votes on. Limited government, economic freedom and individual liberty.”

So why wouldn’t Grand Rapids business leaders be proud to have such a widely admired young representative? They say they want a congressman who will work with others to “get things done.” Andrew Johnston, the political director of the Grand Rapids Chamber of Commerce, told the Wall Street Journal, “There is frustration among those who think his rigidity makes it difficult to move forward on legislation.” He promised that Ellis “will have access to funds that will be helpful to his campaign.”

It’s not just local businessmen. Washington lobbyists are rallying around Ellis. He’s also put $400,000 of his own money into his campaign—in the form of loans, which can be paid back out of more lobbyists’ contributions if he wins the race.

In an interview with the Weekly Standard, Ellis strikingly dismissed Amash’s principled, constitutional stand: “He’s got his explanations for why he’s voted, but I don’t really care. I’m a businessman, I look at the bottom line. If something is unconstitutional, we have a court system that looks at that.”

Most members of Congress vote for unconstitutional bills. Few of them make it an explicit campaign promise.

Amash does have the support of Freedomworks, Club for Growth, and some local business leaders such as several members of Amway’s DeVos and Van Andel families. And polls show him 20 points ahead of Ellis. But Rep. Eric Cantor had a poll putting him 30 points ahead of David Brat before he unexpectedly lost, and Ellis’s self-funding now amounts to $800,000. So Amash can’t take anything for granted.

Of course, the Export-Import Bank is now a hot issue in Congress. Amash opposes it; the Chamber vigorously supports it. So it looks like it may be tough to support free markets, oppose bailouts and corporate welfare, and receive the support of the nation’s largest business organization.