McConnell leads Grimes by 4

Even the left leaning PPP poll gives Mitch McConnell a 4 point lead over Democratic challenger Alison Lundergan Grimes. McConnell takes 44% of the vote to Grimes' 40%. When Libertarian candidate is thrown into the mix McConnell gets 47% with Grimes getting 42%. I had assumed that Kentuckians would like Grimes even if they wouldn't vote for her but she is upside down in her favorability ranking. Only 41% have a favorable opinion of Grimes while 45% express an unfavorable opinion.