One of the arguments made by those advocating that Michigan adopt the Obamacare Medicaid expansion is that the law is a "done-deal," so this state's government and people should just knuckle under and pay up. This is not correct. In fact, the law is highly vulnerable on any number of fronts.

Here’s what "vulnerable" means, given that Obamacare can’t be repealed under the current administration: When it fully kicks-in on Jan. 1, the mayhem this law inflicts on families, employers and the nation’s health care system may be so obnoxious that Congress — including the Democratic-controlled Senate  — may be forced to open the "Affordable Care Act" for major amendments that reduce the damage.

Here are just some of the ways Obamacare is vulnerable, with evidence for each: 

Legal
Oklahoma sues over illegal federal exchange subsidies – Cato Institute
Small business lawsuit challenges illegal subsidies – Competitive Enterprise Institut
Birth control lawsuits – Health Care Lawsuits blog

Political
Poll Finds Support Slumping for Health Law – Wall Street Journal
Kaiser’s polling indicates that only 37 percent of Americans like Obamacare – Weekly Standard
Labor unions break ranks with White House on ObamaCare – The Hill
Democrats “Nervous,” “Concerned” About “Complex,” Confusing, “Train Wreck” ObamaCare - U.S. House Speaker John Boehner

Administrative Complexity
Is Obamacare Too Complicated to Succeed? – NYTimes.com
Navigating the ObamaCare Maze – John Goodman
Applying for ObamaCare—Still Not Simple  - Grace-Marie Turner
Obamacare architect Rockefeller: It's “beyond comprehension” – Paul Bedard, Washington Examiner

Extreme Technological Complexity
Spending on exchanges more than double initial projections – Bloomberg
“Let's just make sure it's not a Third World experience…” – Obama Administration Official
States Overwhelmed by Obamacare Exchanges' Complex Rules, Bureaucracy - NewsMax

Perverseness
The Law of Unintended Consequences, Obamacare Edition - National Review
Some Unions Angry With Obamacare's Unintended Consequences – Huffington Post
The IRS's Role in Implementing Obamacare – Heritage Foundation
Small business on "hiring strike" due to law - CNBC

Insurance Price Sticker shock
Despite liberal spin, Obamacare will raise CA premiums -  Avik Roy in Forbes
ObamaCare’s raising insurance costs – Daniel Kessler in the Wall Street Journal
The rate-shock danger – The Economist
ObamaCare's Health-Insurance Sticker Shock – Wall Street Journal

Fiscal Unsustainability
CBO: Obamacare costs double to $1.8 trillion in first decade – Washington Examiner
Obamacare Budget Bombshell – Heritage Foundation
Trust not in Obamacare Medicaid Cost-Share Promises – Mackinac Center
Michigan Lawmakers Will Add $22 billion to National Debt with Expansion – Mackinac Center
States Can Save Taxpayers $609 Billion by Refusing Medicaid Expansion – Goldwater Institute/Wall Street Journal

This list was compiled before the Obama administration revealed on July 2 that it plans to delay enforcement of the law's "employer mandate." That may be the most compelling reason Obamacare is vulnerable, as explained here.