MADISON, Wis. -- Prosecutors in state Rep. Scott Jensen's corruption trial used testimony from a graphic artist on Thursday to try to show that Jensen knew campaign work by state employees was illegal and took steps to cover it up.

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For a second day, Eric Grant took the stand in the trial for Jensen, R-Waukesha, and Republican aide Sherry Schultz.

Grant, who worked for the state Assembly Republican Caucus from 1995 through 2000 under the direction of state lawmakers, testified that employees of Assembly Republicans were told to lock the doors to their office while preparing campaign mailings, among other steps to hide their work on GOP political campaigns.

Grant said that caucus directors instructed employees to hide campaign materials when visitors came to their state office. He said that campaign work ramped up during the 1998 elections, becoming a daily routine.

Grant said on Wednesday that they even developed a production-on-demand system to turn out literature for GOP candidates. He said that he spent almost all his time in election years using state computers, printers, phones and fax machines to produce and ship campaign literature.

The prosecutors asserted that Grant was illegally doing campaign work while on the state payroll.

He received full immunity for his testimony.

Besides Grant, prosecutors called three other graphic designers who all worked for the ARC at various points, WISC-TV reported.

Jensen faces three felony counts of misconduct in office stemming from allegations that he used state-paid caucus workers to recruit and help GOP candidates while he was Assembly speaker.

Prosecutors said that caucus workers were supposed to serve as lawmakers' researchers, not campaign workers.

Jensen is also accused of hiring and directing Schultz to work as a full-time fundraiser for Assembly Republicans while she was on the state payroll.

Schultz faces a felony misconduct count of her own and is standing trial alongside Jensen. He also faces a misdemeanor for allegedly using his public position to benefit a private campaign committee designed to help Republican candidates.

The trial is expected to last three weeks.

Jensen is expected to take the stand in his own defense, WISC-TV reported.

Jensen is the last of five state legislators charged in 2002 after media reports detailed allegations that lawmakers were using their taxpayer-funded staffs to run campaigns and collect political contributions.

The other four -- ex-Democratic state Sens. Brian Burke and Chuck Chvala and former Republican Reps. Steve Foti and Bonnie Ladwig -- have struck deals with prosecutors to avoid trials.

Foti, once the second-ranking lawmaker in the Assembly, made an agreement and pleaded guilty to corruption charges last month. As part of the agreement, Foti agreed to testify against Jensen.

Burke and Chvala were sentenced to jail time. Former Assistant Assembly Majority Leader Ladwig is expected to pay $4,500 in fines and restitution, WISC-TV reported.

NOTE: WISC-TV's Colin Benedict provides behind-the-scenes coverage of the Jensen trial in his new blog.