To most Republican strategists, there's no bigger nightmare than Donald Trump as the GOP's presidential nominee in 2016. This week, just about every Democrat running for president, Senate, House, and their respective campaign committees sought to tie Republicans to Trump and brand them one big bunch of xenophobes. Talk of a down-ballot Republican apocalypse has reached fever pitch. Even setting aside the remoteness of a scenario in which Trump would face Hillary Clinton in a one-on-one contest, such talk is premature and possibly overblown. Given Trump's unpopularity with the electorate overall, there's a possibility he could end an era of very close and competitive presidential elections and suffer a landslide defeat (by modern standards). But what would that mean down-ballot? If Trump becomes his own radioactive island, GOP candidates in swing districts would have no choice but to renounce him and run far away for cover. The challenge in assessing their odds for survival in such a scenario is that there hasn't been a blowout presidential election in a very long time. However, history is on the GOP's side. Since

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