Chicagoans have a choice Sunday: either join the 1.5 million people expected to watch the Chicago Marathon -- or try to avoid it altogether. But it won't be easy, as 45,000 runners will clog up the 26.2 mile race course and more streets for a good part of the day. Meanwhile, those running in the race should take precautions, experts said, especially with forecast temperatures in the high 70s.
Runners, Watchers Ready For Chicago's Big Race
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