Republicans are the primary users of the filibuster

New Filibuster Chart Puts the Lie to Republican Claims:
People For the American Way has developed a chart compiled from Congressional Research Service data that lists the judicial and executive branch nominees filibustered prior to the Bush administration. Twenty-six of the filibusters – more than three-quarters of the total – were initiated by Senate Republicans.
You can view the chart here (pdf).

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it is not like you did not already know this, but that’s the case.