Whooooo are they?

The following paragraph is from Tony Perkins's newsletter Washington Update. The article is about a bill introduced into Congress to permanently ban the federal funding of abortion procedures. Read down to the yellow-highlighted sentence, and tell me which of the blue-highlighted phrases is the referent of "they". 

This push is especially timely given that a group of pro-abortion Senators are trying to open the doors to abortion on military bases. Meanwhile, HHS officials and other abortion proponents still insist that the new health care law won't fund abortions--despite an independent analysis from Congressional Research Service, which reported that there's nothing stopping the agency from covering the procedure in its high risk pools. Regardless of what Americans think about the legality of abortion, they object to paying for it by overwhelming majorities--which could explain why the Smith-Lipinski bill has such broad bipartisan support. Any member who claims to be moderate on abortion knows that they have to vote for this legislation to prove it. Passing the No Taxpayer Funding for Abortion Act is the only way to make pro-life policies permanent and apply them across the federal government. Even the Left should have no trouble supporting a bill that they insist is the status quo. Encourage your member to co-sponsor the Smith-Lipinski bill. Click here to contact them today!

What helped you decide who/what "they" were?
(Writing the title reminded me of the Cheshire Cat's query to Alice, in the old Disney animated feature: "Whhoooo aaaaare you?")