This story is still developing and I haven't been able to confirm anywhere else but according to Bloomberg News http://www.bloomberg.com/... there are a few "dozen" Republicans who are ready to back the tax rate compromise.
A few dozen Republicans have joined a bipartisan call to break the impasse between President Barack Obama and House Speaker John Boehner over taxes for the highest- earning Americans. The Republicans signed a letter calling for exploration of “all options” on taxes and entitlement programs, a signal that some rank-and-file members are ready to bargain.
Story still developing will update accordingly....