Here is a listing of think tanks who have established research pages and comment on the forthcoming elections.
Council on Foreign Policy - foreign policy and the elections analyses the stance of the candidates.
AEI American enterprise and the economy .
Cato ( libertarian )
Center for American Progress
Clarement Institute (statesmanship and political philosophy has commentary on the debates)
Kaiser Family Foundation - weekly polls on issues effecting voters / issues on their minds.
Harvard university analysis