Senator Scott Brown has accused his Democratic opponent, Elizabeth Warren, of being anti-business.

But Warren wants voters to know she loves businesses – small businesses.

Echoing the populist themes she laid out in her speech to the Democratic National Convention on Wednesday night, Warren released a new television ad today argues the political system favors corporate interests at the expense of small businesses.

“Small business owners bust their tails every day, but they can’t afford armies of lobbyists in Washington,” Warren says in the ad, which shows men and women in a clothing store, an insurance office, a coffee shop, and other small businesses. “No one says it, but the system is rigged against them.”

As the ad shifts from small businesses to show towering glass-and-steel-skyscrapers, a narrator says: “Big profitable corporations pay no taxes. Big oil companies pocket billions in tax breaks. Elizabeth Warren’s plan: get rid of the loopholes and special breaks. And level the playing field for small businesses. Give everyone a chance to succeed.”

Warren, a Wall Street critic and Harvard Law professor, then closes the ad with a declaration that “Washington shouldn’t be rigged for the big guys.”

The spot is an attempt to rebut Brown’s portrait of Warren as an enemy of free enterprise and to appeal to frustrated middle-class voters and Democrats. Much of the language is similar to Warren’s speech at the convention.

“People feel like the system is rigged against them,” she declared in that speech. “And here’s the painful part: They’re right.”