Trump has become the defining factor in the race to replace humiliated California congressman Duncan Hunter

SAN DIEGO — Even before Rep. Duncan D. Hunter resigned from Congress last month, it was no secret that the race to replace him was going to get brutal, especially on the Republican side of the aisle.After all, the top Republican front-runners, former San Diego City Councilman Carl DeMaio and former Rep. Darrell Issa, are two of San Diego County’s most well-known firebrands.What has intrigued political observers, though, are the messages each has used to attack each other. DeMaio and Issa have traded pointed barbs for months in TV ads, tweets, mailers, and forums — all about who would be the st...

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