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The most important election of the year, apart from the one occurring on November 8, takes place today. That’s when Speaker of the House Paul Ryan goes up against the vice president of a water filtration company, Paul Nehlen, in the first serious primary challenge that Ryan has faced in the 18 years since he was elected to Congress. The odds for Nehlen are long. Of nearly 5,000 primaries held between 1992 and 2012, only 31 challengers toppled the incumbent. Nehlen also seems a little…