Prosecutors held back on using Obama's name

Barack Obama's name could have been invoked more at the corruption trial of his former fund-raiser Tony Rezko.

But it appears prosecutors opted against bringing Obama into the mix during the two-month trial.

Newly unsealed documents show that prosecutors sought to call witnesses to testify about Rezko's ties to Obama, the presumptive Democratic nominee for president.

The Illinois senator was the recipient of "straw" campaign contributions made by others on behalf of Rezko -- money that Obama has since given to charities.

The documents indicate that prosecutors considered offering witnesses to explore why Rezko used others to contribute to Obama and also to Blagojevich, and U.S. District Judge Amy J. St. Eve ruled that they could. But they did not end up offering any such testimony during the trial.

"Witnesses will testify that Rezko was a long-standing supporter and fund-raiser of Barack Obama," prosecutors wrote.

Later, St. Eve ruled that Obama references would be allowed into the trial, but prosecutors apparently opted not to invoke Obama's name.