Today on "Special Report":

Carl Cameron reports: Democratic front-runner John Kerry (search) made a clean sweep in Tuesday night's primary and caucuses -- That makes the Massachusetts senator's win record 18-2.

GUEST PREVIEW: Will a constitutional amendment ban gay marriage? We'll ask Rep. Marilyn Musgrave, R-Colo.

Wendell Goler reports: Is Social Security (search) not so secure? We'll tell you what Federal Reserve Chairman Alan Greenspan (search) had to say.

Major Garrett reports: First lady Laura Bush and Veep Dick Cheney raise money for the president's reelection effort. We'll have the details.

Steve Centanni reports: Will the U.S. help put an end to political unrest in Haiti (search)? Find out.

Details on those stories and more on Special Report with Brit Hume at 6 p.m. ET.

— Guests and topics are subject to change