Enlarge USA TODAY file photo A statue of "Honest John" Burke, governor from 1907 to 1913, stands in front of the North Dakota's state capitol building in Bismarck. North Dakota had the highest rate of public corruption convictions won by federal prosecutors from 1998 through 2007. North Dakota tops analysis of corruption WASHINGTON  Its largest city is legendary for machine-style politics and its elected leaders have been under investigation for years, but by one measure, Illinois is not even close to the nation's most-corrupt state. North Dakota, it turns out, may hold that distinction instead. Federal authorities arrested Illinois Gov. Rod Blagojevich Tuesday after a wiretap allegedly recorded him scheming to make money on his appointment to fill the U.S. Senate seat left vacant by President-elect Barack Obama. Blagojevich, a Democrat, ran for election in part on cleaning up after his predecessor, Republican George Ryan, who was convicted in 2006 of racketeering, bribery and extortion. IN ILLINOIS: Obama 'appalled and disappointed' by Blagojevich arrest "If it isn't the most corrupt state in the United States it's certainly one hell of a competitor," Robert Grant, head of the FBI's Chicago office, said Tuesday. On a per-capita basis, however, Illinois ranks 18th for the number of public corruption convictions the federal government has won from 1998 through 2007, according to a USA TODAY analysis of Department of Justice statistics. BLAGOJEVICH SCANDAL: News is a recycled blot on Chicagoans' pride Louisiana, Alaska and North Dakota all fared worse than the Land of Lincoln in that analysis. Alaska narrowly ousted Republican Sen. Ted Stevens in the election in November after he was convicted of not reporting gifts from wealthy friends. In Louisiana, Democratic Rep. William Jefferson was indicted in 2007 on racketeering and bribery charges after the FBI said it found $90,000 in marked bills in his freezer. Jefferson, who has maintained his innocence and will soon go to trial, lost his seat to a Republican this year. But North Dakota? Don Morrison, executive director of the non-partisan North Dakota Center for the Public Good, said it may be that North Dakotans are better at rooting out corruption when it occurs. "Being a sparsely populated state, people know each other," he said. "We know our elected officials and so certainly to do what the governor of Illinois did is much more difficult here." Morrison said the state has encouraged bad government practices in some cases by weakening disclosure laws. North Dakota does not require legislative or statewide candidates to disclose their campaign expenses. The analysis does not include corruption cases handled by state law enforcement and it considers only convictions. Corruption may run more rampant in some states but go undetected. Michael Johnston is a political science professor at Colgate University in New York — which is ranked just after Illinois for corruption convictions. Johnston, who has studied political corruption for 30 years, said places such as Illinois gain a bad reputation that becomes a self-fulfilling prophecy. "Expectations build up … and you replicate those expectations when you get to the top of the ladder," Johnston said. "It gets repeated." Guidelines: You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. Read more