No, he attacked everyone in the Republican race, not necessarily by name, in order to sow discord and hand the election to Obama. His old man did the same thing on behalf of other Demwit candidates. That’s what they’re both about.
Rand Paul endorsed and campaigned for Mitt Romney.
Ron Paul was famously soft on Mitt Romney.
There Really Is A Secret Alliance Between Ron Paul And Mitt Romney http://www.businessinsider.com/the-truth-about-ron-paul-alliance-with-mitt-romney-2012-4
If you watch the Republican debates, he always pulled his punches against Romney. For instance: He would excoriate Huckabee, Gingrich, etc., for having made comments that he “interpreted” as supportive of some element of Obamacare from years before Obamacare was even a proposal, and meanwhile give Romney a complete pass for Romneycare.