Why do Republicans say that Dems are against capitalism?

There are a lot of affluent Democrat politicians including John Kerry, Clinton, Obama, Pelosi, etc, who have benefited immensely from capitalism. A lot of people on Wall St. are Democrats along with Bill Gates and Warren Buffet who have made wealth through capitalism. But yet Republicans say that Democrats are against it. I'm not, I love capitalism. Even Michael Moore who made a doentary about it said that he loves capitalism, so I don't understand where these claims are fabricated from.