Santorum takes heavy fire in Arizona Republican debate |
Obama urges corporate tax cut, closing loopholes |
Assad forces renew barrage on Syria's Homs |
Fitch downgrades Greece on debt swap plan |
Congress members threatened with biological attack |
Judge strikes down law mandating sale of |
Home resales at 1-1/2 year-high, supply falls |
Iran defiant as U.N. nuclear talks fail |
U.S. advisers back experimental obesity pill |
Japan cuts in Iran crude imports could be over 20 percent |