Prices at the pump are third in list of top U.S. worries in poll. WASHINGTON - Unseasonably high gasoline prices are causing a new political headache for the White House and Republican lawmakers already on edge as they head into their re-election campaigns. President Bush's sagging approval ratings over the Iraq war and a host of other problems have led him to begin a White House staff shake-up. New polling data suggest the rising cost of gas could cause more political damage. Three-quarters of Americans said they disapprove of Bush's handling of the gas price surge, according to an ABC...