The first one, darker coloration to absorb more heat from the sun. <3
Judicial Review is the Court's Examination of the Constitutionality of the actions of Congress and the President (and the court's right to nullify what the other branches of government have done if they find it unconstitutional). This process was first established by the Marbury v. Madison Supreme Court Case.
There are many influences that could potentially lead a member of the House of Representatives to vote against the wishes of the people in their district. Simply the member could think that their constituents are incorrect in their view or don't possess enough information so therefore, they decide not to vote in accordance with the views of their constituents. Another influence could be that of their political party or the elites in their party that wish for the member to vote a certain a way. Another influence could be special interest groups or lobbies that seek to sway the views of Congress Members. These are all factors that together or separately could make a member of Congress vote in opposition of their constituents views.