Frustrated with the White House and a key Republican, supporters of Rep. Katherine Harris' (R-Fla.) 2006 Senate campaign lashed out at the administration yesterday for seeking to convince another prominent GOP official to enter the race. "It's unimaginable that the White House folks and the National Republican Senatorial Committee would be so disloyal to Katherine Harris, especially after all she has done for the Bush family and the Republican Party," a Florida political operative who supports Harris said. "It's unconscionable and a stab in the back." Harris backers are irritated that State House Speaker Allan Bense met with White House...