Nebraska gubernatorial candidate Chuck Hassebrook is calling for a ``clean elections pact'' that includes campaign spending limits and promises to repudiate any third-party ads that are aired about the race.

The Democratic hopeful sent an open letter Tuesday to Republican Pete Ricketts. The proposal would require both candidates to ``aggressively discourage'' third-party ads, require that any negative statements come directly from the candidates, and impose a $3 million spending limit on each campaign.

Hassebrook says the pact will only work if both candidates agree to abide by the rules.

Ricketts campaign manager Matt Miltenberger says the sentiment is appreciated but the proposal is disingenuous. Miltenberger notes that Hassebrook and the Nebraska Democratic Party criticized Ricketts shortly after Ricketts won the GOP primary election.