…at least among Republicans, thanks to the presidential race. And, if you believe Durbin, McCain backing off the issue is having a good (bad from Durbin’s perspective) effect. From the Washington Post:

One White House hopeful, Sen. Sam Brownback (R-Kan.), has all but renounced a career-long stance favorable to immigrant rights. And the co-author of last year’s bill, Sen. John McCain (R-Ariz.), has been largely absent from this year’s negotiations, as he soft-pedals his pro-immigration stance.
McCain spokeswoman Eileen McMenamin said yesterday that the senator remains committed to a bill that would strengthen border controls, back guest workers and offer illegal immigrants a path to citizenship.
But Senate Majority Whip Richard J. Durbin (D-Ill.) said McCain’s absence from the negotiations has been “a big factor” in the rising tide of Republican opposition