San Francisco Chronicle: — Sen. Barbara Boxer, D-Calif. – She chairs the Senate Environment and Public Works Committee and sees this bill as her chance to leave a lasting legacy. She’ll have a tough task fighting off “poison pill” amendments aimed at killing the bill. — Sen. John McCain, R-Ariz. – The presumptive GOP nominee has long championed a cap-and-trade bill, despite opposition from President Bush and most Republican lawmakers. He’s said he’s likely to miss this week’s climate votes, but …