BOSTON (AP) — Prosecutors have finished presenting their case against former Massachusetts Treasurer Tim Cahill in his corruption trial.

Cahill is accused of airing taxpayer-funded ads for the state lottery as a way of promoting his 2010 independent campaign for governor.

As treasurer, Cahill oversaw the state lottery. He is charged with violating state ethics laws and procurement fraud. He has said the ads were designed to promote the lottery, not his unsuccessful gubernatorial campaign.

Prosecutors rested their case Wednesday. The defense was expected to begin presenting its own witnesses Wednesday afternoon.

Cahill is expected to take the stand in his own defense as early as Thursday.

Testimony began on Nov. 5.

Copyright 2012 The Associated Press.