"Usually when a candidate comes in, they come from a Democratic perspective or a Republican perspective — so you kind of know whether they will go and what they are about," said Sen. Robert P. Casey Jr., Pennsylvania Democrat. "But there is an uncertainty about where the president will be on an issue or in terms of his focus on an issue on a particular day or week. I hope we can [get a] better sense of that in short order."
The new supporters Tuesday were Sens. Christopher A. Coons of Delaware and Robert P. Casey Jr. of Pennsylvania, who said they'd studied the agreement closely and talked it over with experts and concluded that, warts and all, it would advance U.S. goals.