Miami-area Democrats, seeking to show they have national support for three key congressional races against Republicans, brought in some extra fire power Monday: U.S. Rep. Chris Van Hollen, head of the committee that helps House Democrats get elected.

Van Hollen of Maryland pledged that the three Democratic challengers will have the backing of the Democratic Congressional Campaign Committee he oversees.

''We are absolutely committed to winning these seats because we think there is a tremendous opportunity in South Florida,'' Van Hollen said, addressing the group at a Coral Gables restaurant.

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