The most costly primaries you've never heard of are raging on D.C.'s doorstep

Two U.S. House races in Maryland suburbs near Washington, D.C., are among the most expensive congressional primaries in U.S. history, with outside groups spending $12.5 million and candidates spending $10.5 million. Candidates express concern over excessive spending, noting voters are confused by the volume of ads and questioning the necessity of such high campaign costs.