MA will 4 US Senate Races during the last 4 years and at least 3 of those 4 US Senate Races are highly competitive.
2010 MA Special (Coakley-D vs Brown-R) Democrats need to anticipate the Brown insurgency and Coakley-D ran a mediocre campaign.
2012 MA Regular (Warren-D vs Brown-R) Presidential coattails and grassroots helped Warren. Warren-D won by a margin similar to the 1996 (Kerry-D vs Weld-R)
2013 MA Special (Markey-D vs Generic-R) Winslow-R or Sullivan-R are the generic-R. Markey-D defeats them by a narrow to double digit margin.
2014(Markey-D wins a full 6 year term against a sacrificial lamb opposition)