The latest Bluegrass Poll in the Louisville mayor's race shows Democratic candidate Greg Fischer with his widest lead yet.The survey of likely voters has Fischer with 48 percent and Republican Hal Heiner with 42 percent. The poll has a margin of error of just over four percent.The first Bluegrass Poll in the race showed the two candidates tied, each with 45 percent of the vote.The second poll gave Fischer a two-point lead, which was within the margin of error.Independent candidates Jackie Green, Nimbus Couzin (cousin) and Jerry T. Mills earned a total of four percent. Six percent of voters were undecided.The poll was conducted by SurveyUSA for the Courier-Journal and WHAS11.