Heritage Action, one of the influential conservative groups that helped to sink House Speaker John Boehner's (R-Ohio) "Plan B," is urging lawmakers to vote "no" on the" fiscal cliff" compromise.

The group's position is little surprise given its stance throughout the fiscal negotiations: Boehner's "Plan B" would have extended the Bush-era tax rates on income of $1 million or less; the new deal hashed out by the White House and Senate GOP leaders would set the threshold lower, extending the rates only on income of $400,000 or less for individuals and $450,000 or less for couples.

"This kick-the-can approach, necessitated by a president who refuses to stop campaigning and start seriously addressing our nation’s fiscal problems, is not an adequate solution to America’s coming fiscal crisis, which is a result of overspending, not under-taxing," reads Heritage Action's message to lawmakers. "Allowing a tax increase to hit a certain segment of Americans and small businesses is not a solution; when combined with the coming Obamacare tax increases, it all but ensures a weaker economy."

At least one prominent tea-party favorite -- Sen. Rand Paul (R-Ky.) -- has already come out against the proposal, even before the deal had been fully hashed out.