It makes sense for Sanders to go on the offensive. He notched a win in the New Hampshire primary earlier this month, but suffered defeat at the Nevada Democratic caucuses over the weekend. Looking ahead, the primary race doesn’t seem likely to get easier for Sanders. Clinton is considered the favorite to win the rapidly approaching South Carolina Democratic primary given her popularity with black voters, a key demographic in the state. In March, Sanders will face off against Clinton on Super Tuesday, a series of contests that could prove a make-or-break moment for his insurgent campaign.

The strategy is not without risk, however. Effective political candidates point out ways they differ from their rivals. But Sanders has made promises not to run a negative campaign, and Clinton allies are likely to point to his latest plea as evidence of hypocrisy. If that happens, it wouldn’t be the first time the Clinton campaign has accused Sanders of “going negative.” Highlighting his opposition to big money in politics also opens Sanders up to fresh attack. That’s because he can’t actually stop super PACs from supporting him, and a nurses union super PAC has already spent hundreds of dollars to support his candidacy.

As the primary drags on, Sanders needs to expand his appeal and increase his name recognition. Since his critiques of Clinton largely reiterate points he has made before, it is hard to say if the effort will broaden his appeal. If Sanders keeps it up, though, the strategy will certainly garner him attention, and that could introduce his message to voters previously unfamiliar with it. There is also reason to believe that Sanders’s effort will tap into a vein of existing voter belief. New Hampshire exit polls show that voters who valued honesty and trustworthiness overwhelmingly backed Sanders over Clinton, while Clinton won voters who said that experience mattered most. If nothing else, the senator’s critiques are sure to fire up his loyal fans.

At his Monday press conference, Sanders suggested that Clinton may well be in the pocket of Wall Street and special interests, and talked up his own reliance on small-dollar fundraising. “Here is the truth, and a very profound difference between Secretary Clinton and myself,” Sanders said, “Secretary Clinton has a number of super PACs, which today are raising very, very large sums of money from Wall Street and other powerful special interests.” Sanders also implied that Clinton can’t be trusted to stand with American workers by highlighting his record on trade policy. He talked up his opposition to trade deals that he believes unduly benefit corporations, and called into question the sincerity of Clinton’s opposition to the Trans-Pacific Partnership, a Pacific Rim nation trade pact. Clinton came out against the deal, which Sanders opposes, during her 2016 bid, but expressed confidence in negotiations over the trade agreement as secretary of state.