A pledge card with the letter from Secretary of State Kenneth Blackwell, a Republican who co-chaired the Bush-Cheney election campaign in Ohio, said "corporate & personal checks are welcome."

Corporate donations are illegal in Ohio.

His spokesman, Carlo LoParo, said Saturday that any corporate donations would be returned.

Blackwell said the request sent to GOP donors and activists was an oversight. His campaign's fund-raising coordinator, Jeff Ledbetter, blamed a printer for the mistake, saying it used a template for an issue committee, which is allowed to accept corporate donations.

Ledbetter told The Columbus Dispatch that no corporate donations had been received in response to the letter.

Blackwell's letter also praises Republicans for helping deliver Ohio to President Bush.

U.S. Rep. John Conyers, D-Mich., who prepared a report on election problems in Ohio, said the letter supports suspicions that Blackwell's actions as secretary of state during the election "stemmed from partisan political motivations" to help Bush.

Conyers said in a statement that the letter "evidences Secretary Blackwell's poor judgment at best, and the manipulation of election administration for partisan purposes, at worst."

A group of voters citing fraud has challenged Bush's 118,500-vote win in Ohio with the state Supreme Court, citing irregularities including long lines, a shortage of voting machines in minority precincts and problems with computer equipment.

Blackwell has maintained that he is permitted to campaign for Bush and that Ohio's election system has checks and balances to ensure fair elections.

"I have an obligation to follow the law," Blackwell said.