LANSING, Mich., Sept. 28 /PRNewswire/ -- An already tight race for Michigan's 17 electoral votes between President George W. Bush and U.S. Senator John Kerry, the Democratic nominee, just got tighter. Kerry leads Bush by only two percentage points, his smallest edge in three months, and it appears the number of undecided voters may be expanding slightly. Kerry is ahead of Bush, 45%-43%, with only 1% for Ralph Nader. About 11% of the state's voters claim to be undecided, refused to answer whom they will vote for, or say they don't know (U/RtA/DK). Those are the conclusions of a statewide...