Facing a $2.2 billion shortfall in funding, mayors from 40 cities and towns surrounding Denver want voters to double the current 0.4 percent sales tax to expand light rail. But rather than campaign for the extra cash this November, the mayors want the Regional Transportation District's board of directors to put the ballot proposal off for one more year, reportsÂ The Denver Post. The move comes as Cal Marsella, RTD's general manager, plans to leave for a job in the private sector at the end of July, and Joe Blake, a light-rail cheerleader who heads the Denver Metro Chamber of Commerce, plans to leave his position to become chancellor of the Colorado State University system on July 1, notes theÂ Denver Business Journal. The massive $6.9 billion plan, called FasTracks, would add six new rail lines in the region and extend three in Denver. Longmont Mayor Roger Lange tells theÂ Longmont Times-CallÂ he supports the delay "to make sure everything's in the strongest possible position to have a positive outcome." Meanwhile, a passenger-rail advocacy organization has filed a lawsuit to halt the redevelopment of Union Station, citing waste, writes theÂ Denver Daily News.