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Nebraska Democrats have voted to reject the influence of superdelegates on the party's presidential nominating process.

A resolution approved Sunday at the party's statewide convention in Kearney urges current superdelegates to base their votes at next month's Democratic National Convention on the results of Nebraska's March 5 presidential caucus.

The nonbinding measure also abolishes the Nebraska party from sending superdelegates to future national conventions "without substantial change" to the process.

Just one of Nebraska's five superdelegates -- party leaders whose national convention votes aren't pledged based on state election results -- has publicly committed her support to Vermont Sen. Bernie Sanders despite his victory over former Secretary of State Hillary Clinton in the state's Democratic caucus March 5.

"That's a problem," said Scott Williams, a 34-year-old university professor from Omaha who helped craft the resolution. "We are looking for proportional representation."

Sanders supporters nationwide have decried the superdelegate process, and Democrats in at least two other states, Alaska and Maine, have passed similar measures in recent months.