movement leaders admit they face big challenges as kyung lahton reports. >> reporter: it was a massive party as some 1,200 conservative jews gathered to celebrate the movement's 100th anniversary. the meeting was sponsored by the united synagogue of conservative judaism, the umbrella group for the nation's more than 30 conservative congregations, and from the beginning a century ago, the movement has taken a middle road from the more traditional orthodox jew dayism and the more liberal reform movement. dr. steven wornick is head of the group. >> it is a judaism that is deeply rooted in tradition, but yet has modernity. >> reporter: according the a new research poll by pugh research center only 30% would identify with the judaism, and they say it is in part because of how well jews have assimilated. >> the jews have been wildly successful, and the question becomes, why be jewish and for the first time in jewish history where you can opt-out, the question is, why opt-in? so the religions in the center that take a more nuanced or mosaic approach to religious life, making that life has bee