Kanye West, ever the iconoclast, set social media ablaze last month when he donned a red “Make America Great Again” hat in support of President Trump. Whether a genuine expression of political belief or a publicity stunt, Mr. West’s selfie sparked a much-needed discussion on the role of identity in politics.

At the heart of Mr. West’s message is the idea that all of us—no matter our race, religion or background—have the right to be more than one thing. It’s a message that resonates with millions of Americans who refuse to conform to stereotypes—me included.

I grew up in poverty during the Great Depression, the son of blue-collar parents who passionately defended Franklin D. Roosevelt’s New Deal. As a young man, I followed my father into the steelworking trade, where I became a card-carrying member of a labor union. When I was elected to the Senate decades later, I became best friends with Teddy Kennedy, the chamber’s liberal lion. Today, I am, among other things, an advocate for the legalization of medical marijuana research and a strong proponent of transgender rights in the military.

I am also a Republican.

In fact, I am a lifelong Republican with impeccable conservative credentials, including multiple honors from the Heritage Foundation and an A-plus rating from the National Rifle Association. My record on fiscal policy is so strong that President Reagan dubbed me “Mr. Balanced Budget.” I was the architect of the Religious Freedom Restoration Act, a key player in the Clarence Thomas confirmation hearings, and the principal author of the tax-reform bill that passed Congress in December.