75 million using the YouGov number and just under 100 million using the Nate Silver average. (I think you must have used the more Trump-favorable number AND included children in your computation, which is not reasonable.)
Also worth noting that Nate Silver's measure has been declining for almost 3 weeks, the majority of the duration of the invasion.
Before the invasion, a University of Mariland poll says 55 million and a YouTov poll says 71 million support. These are useful numbers because we know there's a rally around the flag effect that distorts thinking during a conflict.
https://criticalissues.umd.edu/feature/do-americans-favor-at... https://yougov.com/en-us/articles/54158-few-americans-suppor...