jim o'toole of the "pittsburgh post gazette" goes through the contest in pennsylvania. >> ifill: and joel connelly of the "seattle post intelligencer" has the sprint to the finish in washington state. >> lehrer: special correspondent kira kay reports on the fight against breast cancer in bosnia. 1992 war broke out here. the medical system crumbled along with the rest of the country. >> ifill: and a closer look at the engineering feat that saved the chilean miners. margaret warner talks to one american who helped plan the rescue. >> lehrer: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: >> okay, listen. somebody has got to get serious. >> i think... >> we need renewable energy. >> ...renewable energy is vital to our planet. >> you hear about alternatives, right? wind, solar, algae. >> i think it's going to work an a big scale. only, i think it's going to be affordable. >> so, where are they? >> it has to work in the real world. at chevron, we're investing millions in solar and biofuel technology to make it work. >> we've got to get on