(CNN) - The U.S. Senate race out of Connecticut is all tied up between Rep. Chris Murphy, the Democrat, and Linda McMahon, the Republican, a new poll shows.
The two are vying to replace the retiring Sen. Joseph Lieberman, an independent Democrat, who is retiring this year after this fourth term in the upper chamber.
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Murphy has a two point advantage over McMahon among likely voters, 46% to 44%, in the Siena College Research Institute poll, although the difference is very much inside of the sampling error, which is plus or minus 4.2 percentage points.
The survey's authors note that both candidates have a higher unfavorable rating than favorable rating. Nearly five in 10 likely voters view McMahon unfavorably, compared to her 41% favorability rating. Murphy scores 45% unfavorable to 36% favorable.
McMahon is a former wrestling executive who sought a Senate seat in 2010 but lost. Murphy is in his third term in Congress and represents a district which includes Western Connecticut.
Lieberman lost the Democratic primary for re-election to his seat in 2006, then won the general election as an independent.
Although the U.S. Senate race is tight, President Barack Obama has a significant lead in Connecticut over GOP nominee Mitt Romney in the race for the White House.
He leads Romney 53% to 38%, although the 15 point lead is less than his 23 point win over Sen. John McCain there in 2008. Obama's showing there is no surprise: the blue state's 7 electoral votes is rated as safe for Obama on the CNN Electoral Map.
The Rothenberg Political Report rates the Senate race as leaning in Murphy's direction, while the Cook Political Report says the state is a toss up. Both are non-partisan political race analysts.
The poll included 552 likely voters in Connecticut reached by telephone between October 4 and 14.