Racetrack Deaths The 18th horse of the racing season has had to be euthanized at Arlington Park. Why are so many horses breaking down? Arlington Park board chairman Richard Duchossois says the track is doing everything in its power to find out. Elizabeth Brackett reports.

News Analysis with Eddie Arruza Could Senator Barack Obama be a presidential candidate in 2008? He continues to say "no," but there are indications that suggest "maybe." Eddie Arruza and his panelists take a look at the Obama factor and the political climate leading up to the midterm elections. Guests: Melissa Harris Lacewell, Eric Zorn, John Cox John Dean Elizabeth Brackett talks to key Watergate figure John Dean about his latest book, Conservatives Without Conscience.

The Burge Report It's been four years and $7 million in the making. But it was released today — the report on alleged torture committed by former Chicago police commander Jon Burge. Carol Marin will explain what it said and what happens now.

Cook County Democratic Committee Meeting It's official - Cook County Democratic committeemen elected Todd Stroger to succeed his father on the November ballot. Rich Samuels will bring us up to date on the race for president of the Cook County Board of Commissioners. News Analysis with Elizabeth Brackett Chicago public school students are having historic success, according to the latest test scores. But are the results skewed? Elizabeth Brackett and her panel, including Chicago Public Schools CEO Arne Duncan, take a closer look.

Heat Watch The heat index soared above 100 degrees today, making it the hottest day of the year so far in the Chicago area. Meanwhile city workers kept busy trying to keep residents cool in this dangerous weather. Eddie Arruza reports on what brought the heat and how soon we can expect relief. News Analysis with Carol Marin The conflict in the Middle East is escalating rapidly. Carol Marin will be joined by the Israeli Consul General and a panel of experts to look at all sides of the crisis.

News Analysis with Elizabeth Brackett Surprising details about Chicago's 2016 Olympic bid are revealed. Will two separate stadiums for opening and closing ceremonies fly with the International Olympic Committee?

CTA Fire Update Mayor Daley has words of praise for emergency workers and passengers following yesterday's accident on the CTA Blue Line. One day later, both federal and local investigators are trying to figure out what caused the derailment. Christian Farr will have more on the investigation.

Business Briefs Big changes are afoot at Peoples Energy. A Wisconsin utility will pay $1.5 billion in stock for Peoples. But WPS Resources says it will move its headquarters here. We'll also examine the latest on Kraft's $1.7 billion European acquisition and Boeing's surge in plane orders.

Race for Governor Republican candidate for governor Judy Baar Topinka accuses Governor Rod Blagojevich of not following state law when it comes to hiring veterans. Eddie Arruza will report on what each side had to say. News Analysis with Carol Marin DuPage County resident Judy Sirko is one of the growing ranks of what experts call "deep poverty." We'll meet her and talk to the Chicago Tribune reporter who told her story.

Chicago Tonight: The Week in Review Mayor Daley's former patronage chief guilty, Cook County Commissioner Bobbie Steele the front-runner to replace ailing John Stroger, Governor Blagojevich's own inspector general rips the state hiring process, Chicago foreclosures on the rise, the Bulls revamp their line-up, and Cubs skipper Dusty Baker on the hot seat. Guests:

Sorich Verdict The verdict in the Robert Sorich trial is in. Rich Samuels brings us the latest from the federal building. What will it mean for the Daley administration and the city's hiring process? Eddie Arruza and his panel will take a look at the political implications.

Cook County Board Update Correspondent Christian Farr has the latest on the saga of the Cook County Board, now that President Stroger has submitted a signed letter of resignation, clearing the way for the Cook County Democrats to choose a new candidate.

Live from Grant Park We'll go to Grant Park to look in on the wet holiday festivities. Our Christian Farr is standing by live with the latest. Cook County Board Update Todd Stroger's potential ascension to Cook County Board President isn't going as smoothly as planned. Both Congressman Danny Davis and County Commissioner Bobbie Steele have voiced their desire for the post. Davis and Steele join us tonight.

Chicago Tonight: The Week in Review John Stroger anoints his son as his replacement, Senator Barack Obama opines on mixing religion and politics, a proposal to ban trans fats in the city council, the Taste of Chicago opens, Rev. Meeks demands state probe of poor performing teachers, Northwestern University football coach Randy Walker dies suddenly, and the Cubs and Sox clash at the Crosstown Classic. Guests:

News Analysis with Carol Marin John Stroger plans to step aside as Cook County Board President and pave the way for his son, Todd Stroger, to take his place. This news comes more than three months since he suffered a stroke and has raised considerable controversy. Carol Marin and her panel of commissioners will take a look at where things might go from here. Guests: Commissioners Tony Peraica, Forrest Claypool and Earlean Collins

News Analysis with Elizabeth Brackett Although people often joke about having so-called "senior moments," a new Chicago study says they actually could be early signs of Alzheimer's Disease. Elizabeth Brackett and her panel will take up this new development.