Rob has given you a pretty clear picture, here and here, of the true nature of Obama Supreme Court nominee Merrick Garland. He would, exactly as you might expect from an Obama nominee, tilt the Court to the left and eliminate any serious check on the unconstitutional inclinations of this or future Democrat presidents.
That’s exactly why the Republican-controlled Senate (at least for the moment) has vowed not to confirm him. In this case it’s really not about whether he’s “qualified” in a resume sense. As Chief Judge of the U.S. Court of Appeals for the District of Columbia Circuit, he clearly is. That's not the issue. The issue is the damage the country would suffer if we had a fifth Justice as willing to disregard the clear meaning of the law and Constitution as are Justices Breyer, Sotomayer, Kagan and Ginsburg. The Senate is perfectly within its rights to reject Garland for that reason, even though it may have approved him for appointment to a lower court.