Endorsement: Clinton would make a sober, smart and pragmatic president.Trump would be a catastrophe

Laura Richardson

More campaigns pit one political party against itself

More campaigns pit one political party against itself

The race to succeed Rep. Henry A. Waxman is emblematic of a fresh wave sweeping across California's politics and, increasingly, the national landscape: intraparty fratricide as a means of upward political mobility.

Four of California's Democrats in Congress lost to members of their own party in 2012, while Republicans did not knock out a single opposition lawmaker. Another Democratic incumbent faces a stiff intraparty challenge in a Silicon Valley district this year, and the clash for the Waxman seat seems destined to be expensive and bloody.

In part, the fighting exists because districts are increasingly partisan, meaning that the only chance to knock off an incumbent rests...