The candidates chosen by the caucus-convention process win the November election in Utah "in virtually all cases," according to a statement from Powell and Mayne.
"Whether you are Democrat, Republican, unaffiliated or anything else, I believe it is your patriotic duty in this state to at least be at your neighborhood caucus for one night every two years," Mayne said.
Powell told The Salt Lake Tribune that caucuses are for everyone, not just party activists. He said "unaffiliated" is the most popular choice when voters register and that those Utahns are not attending the meetings.
"They can and should still participate in the neighborhood caucus," Powell said. "I believe Utah's caucus day is the real election day."
The bill, titled Utah's Real-Election-Day Education for Neighborhood Caucuses Act, also would require the lieutenant governor to publicize the date and time of the neighborhood caucuses. This year, the Democrats are holding their caucus meetings on March 13 and the Republicans on March 15.
Other parties will announce their caucus dates individually.
In West Valley City, Mayor Mike Winder has proposed that the City Council pass a resolution saying West Valley will not hold council, committee or other meetings on the nights that political parties hold their caucuses.
The resolution also would call on other governments, religious organizations, businesses and community groups to adjust their schedules to avoid conflicting with the caucuses.
The proposed West Valley resolution is scheduled for a vote at the council regular meeting on Tuesday. The proposed bill is slated to be introduced at the opening of next week's legislative session.