Four Republicans Voted Against Ryan's Budget

Keep in mind, this isn't the 2011 budget, which faced the recent shutdown drama. This is the 2012 budget. The House passed Ryan's budget with the exception of four House republicans and all of the democrats:

Republicans voting against the Ryan plan were Reps. Ron Paul of Texas, Walter Jones of North Carolina, David McKinley of West Virginia, and Denny Rehberg of Montana. msnbc

The bill is not expected to pass the Senate, which democrats still control. Paul Ryan's budget essentially dismantles Medicare and Medicaid. It repeals the healthcare act.
Politico explains the no votes.
Rehberg:

In a statement, Rehberg said there were "too many unanswered questions with regard to Medicare reform" for him to get to "yes."

Ron Paul, the wild one:

The least surprising of the nos, Paul lambasted the plan for not going far enough.