OK, we're seeing an approx. 1% per month increase rate in support, and a 1% per month decrease in opposition. But we're still only at 20%....

But.... (and there's ALWAYS a 'but' in politics)...

It's pretty much (for the American people) an academic question at the current time (no current US involvement). But once you have/take an active part in the 'event', that's when your support levels starts to get impacted - and usually negatively.

Many (not all, but many) political pro's have kind of a rule of thumb - If you can't start the 'campaign process' (and Syria would certainly be a 'campaign process') with a formulated idea/approach having at least 35 to 40 percent support at the front end (the starting gate), you are probably backing a loser.

Also. don't be at all surprised if this wasn't John McCain backing Hillary Clinton up. This may very well have been one time where personal politics overrode partisan politics.