Ohio voters favor Sen. Hillary Rodham Clinton over other Democratic presidential contenders, although her lead over Sen. Barack Obama has narrowed since January, according to a poll released Thursday. The Quinnipiac University poll also found that former New York Mayor Rudolph Giuliani leads the Republican contenders among voters in Ohio, which tipped the 2004 election for President Bush. Giuliani is favored by 31 percent of Republicans, compared with 20 percent for Sen. John McCain, 8 percent for former House Speaker Newt Gingrich and 6 percent each for former Massachusetts Gov. Mitt Romney and actor and former Sen. Fred Thompson. On...