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|U.S. House, Maryland, District 3|
was a 2012 Democratic
candidate who sought election to the U.S. House
representing the 3rd Congressional District
. Lockwood was defeated by incumbent John Sarbanes
in the Democratic primary
on April 3, 2012.
- See also: Maryland's 3rd Congressional District elections, 2012
Lockwood ran in the 2012 election for the U.S. House, representing Maryland's 3rd District. Lockwood sought the nomination on the Democratic ticket.  The signature filing deadline for candidates wishing to run was January 11, 2012. Lockwood was defeated by incumbent John Sarbanes in the Democratic primary on April 3, 2012.
|U.S. House, Maryland, District 3 Democratic Primary, 2012
John Sarbanes Incumbent
| David Lockwood