of political boss Tom Dennison. During Dahlman's tenure, the city switched from its original strong-mayor form of government to a city commission government. In 1956, the city switched back. The city clerk is Elizabeth Butler. The City of Omaha administers twelve departments, including finance, police, human rights, libraries and planning. The Omaha City Council is the legislative branch and has seven members elected from districts across the city. The council enacts local ordinances and approves the city budget. Government priorities and activities are established in a budget ordinance approved annually. The council takes official action through the passage of ordinances and resolutions. Nebraska's constitution grants the option of home rule to cities with more than 5,000 residents, meaning they may operate under their own charters. Omaha is one of only three cities in Nebraska to use this option, out of 17 eligible. The City of Omaha is considering consolidating with Douglas County government. Although registered Republicans outnumbered Democrats in the 2nd congressional district, which includes Omaha, Democratic presidential candidate Barack Obama opened three campaign offices in the city with 15 staff members to cover the state in fall 2008. Mike Fahey, the former Democratic mayor of Omaha, said he would do whatever it took to deliver the district's electoral vote to Obama; and the Obama campaign considered the district "in play". Former Nebraska U.S. Senator Bob Kerrey and then-U.S. Senator Ben Nelson campaigned in the city for Obama, and in November 2008 Obama won the district's electoral vote. This was an historical win, as Obama became the first Democratic presidential candidate to win an electoral vote in Nebraska since 1964, only made possible by Nebraska's split electoral vote system. In 2011, Nebraska lawmakers moved Offutt Air Force Base and the town of Bellevue — an area with a large minority population — out of the Omaha-based 2nd District and shifted in the Republican-heavy Omaha suburbs in Sarpy County. The move is expected to dilute the city's urban Democratic vote. Omaha's 2nd District sent its single electoral vote for Joe Biden in the 2020 election. Biden's victory, by more than 20,000 votes, shows Omaha's and the 2nd Districts’ continuing trend toward Democratic politics in recent years. Education Omaha has many public and private educational institutions, including Omaha Public Schools, the largest public school district in Nebraska, which serves more than 47,750 students in more than 75 schools. After a contentious period