The page at the following link has a table which shows the history of Congress using Clause 2 of Section 7 of Article I to override presidential vetoes.
List of United States presidential vetoes
I'm glad that you expressed your concern about the necessary 67+ votes. This because Congress has evidently overriden the vetoes of many presidents, including relatively recently Bush 41 and 43, and also Clinton.
But also note that another freeper has indicated that the best that patriots can do for 2014 elections in the Senate will fall one vote short necessary "Republicans" to override vetoes. But I encourage patriots to not give up.
Also, I deliberately say "conservatives" to include both Democratic and RINO conservatives. So even patriots cannot get 67+ sincere Republicans in Senate, Senate may still have enough conservatives to override vetoes.
I think we will all agree times are VERY different now than Bush 41 & Clinton... The DEMS have all gone Communist and with the exception of a VERY FEW Repubs, there is NOTHING but the Uniparty...
The tipping point is past for a solution from Washington. Even if the Repubs win the Senate, Mccain and his gang will do EVERYTHING within their power to thwart the conservatives like Cruz, Paul & Lee...
If you could get an electoral map with 67 Repub Senators, I bet you’d have trouble even getting a simple majority to agree... It’s going to take YEARS to fix the Senate that we do NOT have to use this as an only strategy...
I think it’s time for US to Cloward/Piven DC...