| Maryland Presidential Primary | Updated 3/4/04 10:43 AM ET 99% Precincts Reporting | Incumbent* declared winner |
| | Candidates | | | | John F. Kerry | 274,198 | 60% | Sen. John Edwards | 118,362 | 26% | Al Sharpton | 20,870 | 5% | Howard Dean | 11,665 | 3% | Rep. Dennis J. Kucinich | 8,325 | 2% | Uncommitted | 8,041 | 2% | Sen. Joseph I. Lieberman | 5,000 | 1% | Gen. Wesley K. Clark | 4,029 | 1% | Mildred Glover | 3,802 | 1% | Carol Moseley Braun | 2,669 | 1% | Rep. Richard A. Gephardt | 1,978 | 0% | Lyndon H. LaRouche | 1,481 | 0% | | | | |
| U.S. House of Representatives District 3 | Updated 3/4/04 10:43 AM ET 100% Precincts Reporting | Incumbent* declared winner |
| | Candidates | | | | Benjamin L. Cardin * | 52,402 | 90% | John Rea | 5,946 | 10% | | | | |
| U.S. House of Representatives District 4 | Updated 3/4/04 10:43 AM ET 96% Precincts Reporting | Incumbent* declared winner |
| | Candidates | | | | Albert R. Wynn * | 41,518 | 83% | George E. McDermott | 8,376 | 17% | | | | |
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