Now that the government shutdown has ended and the president has preserved ObamaCare for the time being, it's worth explaining why my organization, the Heritage Foundation, and other conservatives chose this moment to fight—and why we will continue to fight. The reason is simple: to protect the American people from the harmful effects of this law.

I spent a good part of my summer traveling around the country with the Heritage Foundation's sister organization, Heritage Action, and I heard firsthand from many Americans being harmed by ObamaCare. More and more people have had their work hours cut, their jobs eliminated and their coverage taken away as a result of this new law.

Supporters of ObamaCare usually defend the law by insisting that they want to help people. I won't question their motives. I do wonder, however, if they understand what they're doing to the country.

We know that premiums are going up due to ObamaCare—Americans are getting notices in their mailboxes every day. On Wednesday, Drew Gonshorowski of the Center for Data Analysis at the Heritage Foundation published research that shows exchange premiums are going up in all but five states. In North Carolina, for example, many consumers will find their premiums almost double when shopping on the government exchanges. The hardest-hit states, such as Georgia, Arizona, Vermont and North Dakota, will see premium increases of up to 150%.

Mr. Gonshorowski's research shows that the hardest hit by the increases will be young adults. "A state that exhibits this clearly is Vermont," he writes, "where the increase for 27-year-olds is 144 percent and the increase for 50-year-olds is still 60 percent, but far less. All states exhibit this relationship."