In the midst of one of the most pivotal presidential campaigns in decades, it's easy to forget that we are on the brink of what could be a momentous election in the Senate as well: 34 senatorial seats are up for grabs this year, 19 of them currently held by Democrats, 15 by Republicans. Several of those seats could change parties on Nov. 2, and in a Senate where the GOP holds a narrow majority -- 51 to 49 -- over the Dems and one allied independent, merely a few such changeovers could tip the balance of power. Many observers …
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