Bourgeois politics/elections is quite simply another battlefront on which we must fight. To say that you will not participate in it is to say that it is a battlefront you are willing to concede.
HOWEVER! Participation does not mean participating within a Bourgeois party!
It means creating your own political party, in which you do not at all expect to get elected and in which you treat the bourgeois parties as your enemies! Any reform that you push for or work to have enacted (perhaps even with the assistance of bourgeois parties) should be for the sole purpose of raising class consciousness and hastening the revolution!
This is elaborated upon by Lenin in "What is to be Done?" and "Left-Wing Communism, an Infantile Disorder".