Neither Amy Klobuchar, D-Minn., or her Republican challenger Kurt Bills brought up new issues in the last debate of Minnesota's U.S. Senate race Sunday night at St. Paul's Fitzgerald Theater -- the fourth and final debate between the two before Election Day.

U.S. Sen. Amy Klobuchar's challenger, State Rep. Kurt Bills, says he wants 10 or 12 debates before the November election. But the incumbent has agreed to only two so far. Some political analysts say Klobuchar's strategy is to ignore her opponent.

DFL Sen. Amy Klobuchar's opponent Kurt Bills is pointing to report on the conservative Daily Caller website that suggests Klobuchar, former Hennepin county attorney, had enough evidence to prosecute now-convicted Ponzi scheme leader Tom Petters but declined to prosecute, MPR reports. Her re-election campaign says the allegations made in a story on the website are "inaccurate."

In an hour-long debate hosted by Minnesota Public Radio on Thursday, DFL Sen. Amy Klobuchar and Republican challenger Kurt Bills mixed it up to hooting and cheering supporters on both sides. Bills sharply criticized the incumbent's stances and his fans booed her, and she shot back with pointed words of her own.

Democratic U.S. Sen. Amy Klobuchar has reportedly raised $800,000 in the last three months and has $4.86 million on hand as she heads into the final three-week stretch before Election Day. The spokesman for Klobuchar's Republican challenger, Kurt Bills, says he won't release his financial report until he's required to do so next week.

DFL Sen. Amy Klobuchar and Republican Kurt Bills have agreed to participate in a U.S Senate debate on Nov. 4., according to Minnesota Public Radio. The MPR-hosted debate will be at 7 p.m.

Republican U.S. Senate candidate Kurt Bills hit the television airwaves with an ad criticizing incumbent Democrat Amy Klobuchar for failing to prosecute a fraud case against businessman Tom Petters while she was Hennepin County Attorney. Klobuchar and county officials have said they lacked the evidence to prosecute him in the 1990's. Petters was eventually convicted of running a $3.5 billion Ponzi scheme.

Republican U.S. Senate candidate Kurt Bills says American farmers should be left alone, with less federal support, much like oil producers in western North Dakota. “My goal is to become North Dakota, not Washington, D.C.,” Bills said Wednesday, referring to that state’s oil boom that he said occurred with little government assistance. Bills is challenging Sen. Amy Klobuchar, D-Minn., who is seeking a second term. The two of them made their first joint appearance Wednesday.