Per Eric Z. Beard:

Vim set to python works Ok in a pinch.

{{{
au BufNewFile,BufEnter *.cobra set noexpandtab ts=4 sw=4 filetype=python
}}}

For more native support try [http://bitbucket.org/webnov8/cobra-on-vim/ Cobra on Vim]. This includes a ftdetect, indent, and syntax file.