I doubt we're ever going to know a particularly coherent motivation for someone who, judging by his YouTube, is probably a paranoid schizophrenic.
Well actually his motivation is pretty obvious, but it seems a little pointless given that they already got control of the House.
STOP IT. STOP IT. STOP IT, YOU IGNORANT, PEDOPHILIAC CHICKENHAWK.
If it was a GOP Congressmen, your side would be running with it saying it was proof of the danger of the "Progressive Radicals" that Glenn, Limbaugh, Palin and others always screech about, and you know it.