US Congress Iran Deal

Q182: What will the US Congress do with regards to the recently reached Iran nuclear deal?
Approve It; 10%
Do Nothing: 25%
Reject It, but not override the Presidential Veto: 45%
Reject It, and override the Presidential Veto: 20%
(The first action shall be the one that resolves this question)

The P5+1 recently reached a deal with Iran regarding that country's nuclear program.  Congress now has to decide whether to approve the deal or not.  Under the terms of previously passed legislation, to effectively override the deal, Congress would need a 2/3 majority to override the presidential veto (see story here and here).  However, Congress could still choose to reject the deal to make a statement.  Republicans seem to be generally opposed to the deal, while Democrats are generally supportive.

From reading the news coverage, it sounds like the most likely outcome is that the deal will be rejected, but the Republicans will not have enough votes to override the presidential veto.  However, it seems to me possible that Congress will do nothing (because of different levels of support in the House and Senate) or even approve the deal (although this wouldn't seem to be in the Republicans' interest).