Seriously, what would tempt you to associate with people who are both anti-Obama and specifically define themselves as Constitutionalists? All groups that sit around discussing the Constitution for more than a few minutes on a given issue, and aren't lawyers, are going to go on tangents, something you are familiar with. It doesn't take very long to say "I think X is unconstitutional because of Y" or that "A doesn't respect the constitution because of B and C", they will genuinely fall into four categories, liberals, libertarians, and Conservatives of the primary or Ron Paul flavor, typically with a combination of two or three complaints or a lack there of you can figure out which one you're dealing with:

Conservative: Will be complaining about Obamacare and not respecting States' Rights
Liberals: Will probably not be complaining about Obamacare and States' Rights
Libertarians: Will be Complaining about Gay Marriage and drug legalization, as well as Obamacare and the war
Ron Paul Conservatives: Will not be complaining about legalizing Gay Marriage or Drugs, will also be complaining about Obamacare and the War

Odds are very strong that if any of those factors are in play, the group will be dominated by or at least have majority sympathy for one of those groups, if that doesn't include you find another group, you will only succeed in raising your and their blood pressure while lowering everyone including yourself's apparent age and wit to that of 8 year olds taunting each other on the playground.