Leaking what appears to be brake fluid from left rear wheel area..what could be causing leak?

What is your question?

At first it was a minor dripping now it is a rather substantial leak. The brakes seem lower and spungy and the reservoir(master cyliner)seems to be holding fluid. Vehicle is a 2008 Dodge Magnum SE

How long has your 2008 Dodge Magnum had this problem?

A few days