The title polymer was synthesized by free radical initiation in bulk. The 300 MHz H-1-NMR and 75 MHz C-13-NMR spectra of the polymer were obtained at ambient temperature and analyzed in terms of stereochemistry. The H-1-NMR spectrum provides limited information but suggests that the polymer is atactic. Analysis of the more detailed C-13-NMR spectrum supports this result, i.e. poly(3-methyl-2-vinyl thiophene) is an atactic polymer.