Yoshimura's registration as a member of the DPJ-dominated caucus brings the total number of the active members in the caucus to 122, which is 50% plus one of the 242 seats in the House of Councillors.
For those keeping score at home, the numbers in the House of Councillors are:
DPJ-led four party caucus 122
LDP-Reform Club 82
New Komeito 22
Communist Party 7
If I were Fukushima Mizuho or any other member of the Democratic Socialist Party, I would be thinking hard about keeping my chin up, my eyes bright, a smile glued to my face and, if anyone tries to goad me into offering a comment on whether or not Ozawa Ichiro should testify in the Diet about his accounting troubles, pretend I was stone deaf from now until just after 8 p.m. on election night.