The Senate’s partisan balance will move a tick to the left Thursday, when Cory Booker takes his seat as the 55th member of the Democratic caucus. And the New Jersey newcomer looks increasingly likely to make a bit of history befitting his national profile only a few days later, by providing an essential vote to advance the most important civil rights bill of the decade. Legislation that would prohibit workplace discrimination based on sexual orientation or gender identity is on the cusp of securing a filibuster-crushing supermajority of 60 senators — close enough that proponents are ready to call the question. Four Republicans have announced their support for the Employment Non-Discrimination Act, along with 51 of the current Democrats. Another sure “yes” vote would come from Booker, who as mayor of Newark presided over the first same-sex marriage legally sanctioned by New Jersey, now the 14th state (plus the District of Columbia) where gay marriage is legal. “It’s about time,” he declared after the vows were exchanged a minute after midnight on Oct. 21. That puts the vote count at 56. Senate Health, Education, Labor and Pensions Chairman Tom Harkin, the Iowa Democrat who has made the bill his top priority before retiring next year, is working with the leadership to arrange debate in early November — and he’s said he wouldn’t ask for floor time until he was confident of victory. The targets for the final votes are relatively easy to identify. Eleven gay rights, civil rights and labor organizations have formed Americans for Workplace Opportunity, a coalition that’s spending $2.5 million this month to deploy 30 field organizers to stage 150 grass-roots events and lobby uncommitted senators in nine states. One of the advocacy groups — the American Unity Fund, a creation of big-time Republican donor and hedge fund billionaire Paul Singer — has also hired former GOP Sen. Norm Coleman of Minnesota and former Rep. Tom. Reynolds of New York (who ran the National Republican Congressional Committee in 2005 and 2006) to lobby for ENDA. The Republican targets are Rob Portman in Ohio, Kelly Ayotte in New Hampshire, Dean Heller in Nevada, Patrick J. Toomey in Pennsylvania, Dan Coats in Indiana and Jeff Flake of Arizona, who voted in the House to pass a somewhat narrower version of ENDA six years ago. (more…)