As the Senate wrestles with the Republicans' Keystone XL pipeline legislation, Rubio will be skipping town to bolster his presidential bid. This legislation has implications for fossil-fuel dependence and climate change. And one of its amendments may address offshore drilling in the senator's own state of Florida. But Rubio has a book to sell and a campaign to fund.
The choices we make in the voting booth always carry weight, but they have even greater heft in a year when control of the Senate is up for grabs, when GOP leaders have promised to roll back decades-worth of public health and environmental safeguards, and when the threat of climate change grows more severe.