<sod > 							Alberta Finance Minister Joe Ceci 							 								Larry Wong / Postmedia							 						 					 								 					 			The NDP went on the attack Thursday over the United Conservative Party's potential endorsement of a return to a flat tax on income in Alberta.< eod>< sod >  							Alberta Finance Minister Joe Ceci 							 								Larry Wong / Postmedia							 						 					 								 					 			The United Conservative Party's potential embrace of a returned Alberta flat tax set off political fireworks Thursday, with the NDP slamming it as a regressive tax cut for the rich and UCP Leader Jason Kenney accusing the government of fear mongering.< eod>