Rep. Gary G. Miller, R-Calif., is one of Democrats’ top takeover targets in the House. But to hold his seat, GOP strategists might consider finding another Republican to run against him. In 2012, Democrats had a math problem. Two Republicans and four Democrats ran in the same June primary, after which, the top two, regardless of party, moved on to the general election. It was the first cycle for the system in California and no one was quite sure how it would play out. (more…)