Why can Lisp with all its dynamic features be statically compiled but Python cannot (without losing all its dynamic features)?
There is nothing that prevents static compilation of Python. It's a bit less efficient because Python reveals more mutable local scope, also, to retain some of the dynamic properties (e.g. eval) you need to include the compiler with the compiled program but nothing prevents that too.
That said, research shows that most Python programs, while dynamic under static analysis, are rather static and monomorphic at runtime. This means that runtime JIT compilation approaches work much better on Python programs. See unladen-swallow, PyPy, Psyco for approaches that do compile Python into machine code. But also IronPython and Jython that  use a virtual machines originally intended for a static languages to compile Python into machinecode.
Lisp vs Python -- Static Compilation