WASHINGTON (Reuters) - Democratic U.S. Sen. John Kerry drew election-year fire from President Bush and other Republicans on Tuesday for saying college students could "get stuck in Iraq" if they do not study hard. ADVERTISEMENT But Kerry, who unsuccessfully challenged Bush in the 2004 presidential election, refused to apologize and said his remark was a "botched joke" aimed at the president, not U.S. troops. With the Iraq war a dominant issue in the November 7 elections, Kerry's comment on Monday gave Republicans, struggling to maintain control of the U.S. Congress, a chance to fight back. Kerry's office said later the...