Amid the chaos of the presidential race, it's easy to forget there are other notable primaries brewing in 2016. Down-ballot, pervasive voter discontent continues to embolden credible primary challenges to congressional incumbents, particularly on the GOP side. In fact, between solid open seats and primary challenges, there are likely to be far more competitive primaries in 2016 than competitive general elections. These races can develop quickly and break late, as Majority Leader Eric Cantor's 2014 loss showed. A decline in local print media means there is less coverage of these contests than ever before, making them even more difficult to predict. But above all, the great unknown of 2016 is the potential impact of Donald Trump's voters in down-ballot GOP races, considering many congressional primary dates overlap with the presidential calendar. Below are updated bottom lines on 28 challenges to incumbents worth watching, including 20 Republican seats and eight Democratic seats. Ten are rematches, including several races that turned out to be closer than expected in 2014. It's possible additional serious challengers could emerge as states' filing deadlines approach and

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