WASHINGTON -- Hillary Clinton argued during Saturday’s Democratic presidential debate that she could take a hard line on Wall Street excesses while accepting millions from the industry in campaign contributions. As proof, she pointed to attacks on her campaign funded by two hedge fund billionaires. “You have two billionaire hedge fund managers who started a super PAC and they're advertising against me in Iowa as we speak,” Clinton said, referencing a super PAC called Future45 funded by Paul Singer and Ken Griffin. “So they clearly think I'm going to do what I say I will do.” Those two billionaires,...