Question: Heather R. Mizeur lost the Democratic primary to what American lawyer and politician, who is currently serving as the U.S. Representative for Maryland's 4th congressional district?
Sentence (from "Heather Mizeur"): She has served as a member of the Maryland House of Delegates from January 10, 2007 to January 14, 2015, representing the 20th district in Montgomery County.
Relevant evidence: No