LINCOLN, Neb. -- Sen. Mike Johanns has proposed an amendment to block federal funding for a national organization that works to provide education and housing opportunities for low-income people.Johanns' amendment would prohibit the Association of Community Organizations for Reform Now from receiving funds from the current transportation and housing appropriations bill. Johanns cited 30 cases of voter fraud by ACORN workers. "It's wrong to give tax dollars to a group with multiple convictions of undermining our democratic process and our laws," Johanns said Monday in a news release.ACORN became a lightning rod for attacks by conservative groups during the 2008 elections for what the groups claimed was voter fraud. The association helped hundreds of thousands of minorities and low-income voters register to vote in the election.ACORN acknowledged that small fraction of its canvassers tried to defraud the association by submitting false information in order to get paid for their work. However, it has never been shown that false voter registration caused an improper vote.ACORN is eligible to receive millions of dollars through several different accounts, including Community Development Block Grants and the Neighborhood Stabilization Program.