Generally, politicians are strict and loose constructionists. If they will benefit from a broad interpretation, they are loose constructionists. If their opponents will benefit from a broad interpretation, they are strict constructionists. That's a bit cynical, but it's definitely not far from the truth.
Alexander Hamilton argued vociferously for a broad interpretation of the Constitution, mainly in the context of a central U.S. bank, if my memory serves me well. However, since Jefferson was almost diametrically opposed to Hamilton in philosophy, he argued equally as vociferously that the government was constrained by the Constitution. When he took office and realized what a limit that placed on his powers, he suddenly saw the light in a loose interpretation of the Constitution.
Denis, the key aspect of the strict/loose debate is that the federal government of the U.S. is constrained by a rigid interpretation, but the states are not in any way prevented from passing the same laws that are forbidden to the federal authorities. Since our federal government is considered to have enumerated powers, everything not given to it is reserved for the states. So, while the federal government is unable to change to a great degree (a strict interpretation restricts areas of action, not the modernization of activity though), the states can fill the void so that government authority is not hamstrung in response to new areas of concern.
I am inclined to be a bit more strict in the interpretation of the Constitution simply because the politics of Washington are rarely in touch with the local needs. However, since we currently have a huge federal investigation into the corruption of Atlanta city government, I guess shifting authority to the local level really doesn't alter the end result of entrenched authority. At least there is more oversight of state action by federal authorities than having the feds police themselves (because we've seen how well Janet Reno has done that over the past 8 years).
Isn't it amazing how a few sentence response becomes an essay?