A forum in New Hampshire revealed mostly similar policy platforms but contrasting pitches.
The comments mark one of the Democratic front-runners most pointed attacks on Republicans yet.
The financial disclosure forms for both candidates were released Monday.
The ex-Maryland governor plans instead to launch a political action committee so he can be heard "not just in Maryland, but in the country."
The White House sought to hit back at those who have said that the plan unveiled formally today by the Environmental Protection Agency would kills jobs in the coal industry.
Scott Walker thought he was posing with two enthusiastic young fans. Turns out they were environmental activists holding a fake check.
Trump won't be there. But he could still leave an impact.