[DES MOINES, Iowa -- Plans for a live debate on the eve of Saturday's Iowa straw poll have been canceled after only three candidates -- former Tennessee Gov. Lamar Alexander, commentator Pat Buchanan and Sen. Orrin Hatch of Utah -- agreed to participate. WOI-TV agreed to hold the debate only if six candidates signed on. It was also to be carried by KCAU-TV in Sioux City and WHBF-TV in the Quad Cities.] Obviously, we're very disappointed given the fact that many of these candidates in their appearances throughout the state in recent times have stated that there ought to be forums, there ought to be debates for the candidates to air their views, ... When push came to shove and we presented a forum ... many of the candidates balked or simply didn't respond. Jim Parker