MADISON, Wis. -- The former leader of the state Assembly who was charged along with state Rep. Scott Jensen, R-Waukesha, in the Capitol corruption investigation testified against his former colleague on Friday.

Steve Foti has already been convicted, but struck a plea deal with prosecutors that requires him to testify against Jensen, the former Assembly speaker. Foti's felony charge was reduced to misdemeanor corruption.

Jensen is accused of directing caucus workers and other state employees to run Republican political campaigns while on the state's payroll.

Jensen's co-defendant, former state employee Sherry Schultz, is accused of doing campaign work while being paid by taxpayers.

The prosecution is expected to wrap up its case on Friday.

The trial is expected to last another two weeks, and Jensen is expected to take the stand in his own defense, WISC-TV reported.

Jensen is the last of five lawmakers who were charged in 2002 after media reports detailed similar allegations.

The other four legislators -- Foti and fellow ex-Republican Rep. Bonnie Ladwig and former Democratic Sens. Brian Burke and Chuck Chvala -- all struck plea agreements with prosecutors to avoid trials.

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.

Jensen stepped down as Assembly speaker after he was charged with three felonies and one misdemeanor.

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