Did Obama Have Senate Coattails?

In this election, Democrats unexpectedly scored a net gain of two Senate seats.  Were President Obama's coattails responsible?  To find out, we can look at the 11 Democratic victories in races that RealClearPolitics rated as "tossups" or "leans."  In the table below, we compare the percentage of the vote for the winning Senate candidate and President Obama

		D Senate	Obama
Connecticut	Murphy	55.2%	58.4%
Florida	Nelson	55.2%	50.0%
Indiana	Donnelly	49.9%	43.8%
Massachusetts	Warren	53.7%	60.7%
Missouri	McCaskill	54.7%	44.3%
Montana	Tester	48.7%	41.8%
North Dakota	Heitkamp	50.5%	38.9%
Ohio	Brown	50.3%	50.1%
Pennsylvania	Casey	53.6%	52.0%
Virginia	Kaine	52.5%	50.8%
Wisconsin	Baldwin	51.5%	52.8%

Only in Connecticut, Massachusetts, and Wisconsin did the president get a higher percentage of the vote than the winning Senate candidate, and only in Massachusetts was the difference more than five percent.  We have to conclude that the evidence for any coattail effect is very weak.