President Barack Obama has sought to mobilise Democratic voters in the race for governor in Maine while keeping his distance from the state's bubbling controversy over its Ebola quarantine policies and the nurse who has defied them. Ebola has emerged as a hot-button issue in the November 4 midterm elections with Republicans criticizing the Obama administration for what they characterize as a disorganized response to the appearance of the virus in the US Four people have been diagnosed with Ebola in the country and one has died. (Read: Quarantine for Ebola what is it?) The elections feature races for governor