WASHINGTON — When Mark Sanford was running for a South Carolina House seat in 2013 and wanted to make a point about the brand of liberalism he would fight in Washington, he staged a mock debate with a life-size picture of Nancy Pelosi, which his campaign staff had custom made at a local copy shop.

Today, for $64.95, anyone who wants to make a political prop out of Representative Alexandria Ocasio-Cortez, the Republican Party’s newest antagonist, can buy a 5-foot-6 cardboard cutout of her at Walmart’s online store.

After barely eight months in office, Ms. Ocasio-Cortez and three other progressive women of color have reached a level of notoriety that is virtually unheard-of for freshman House members, largely thanks to the kind of relentless conservative fire usually trained on far more senior Democrats.

Ms. Pelosi, the House speaker whose “San Francisco values” were the focus of tens of millions of dollars and nearly a decade’s worth of Republican attacks, is Public Enemy No. 1 no more. Even Hillary Clinton, who inspired President Trump’s crowds to thunder “Lock her up!” or Barack Obama, whose ethnic background drew false speculation about his citizenship and religion, are no longer inspiring the kind of vitriol the right has leveled at the four women.