In other words, Barack was welcome to visit the troops in his capacity as a US senator -- just not to bring along campaign staff and press.
Well, if you can't get any political mileage or good visuals from it, why bother?
Are Buyers Picky?
The S&P 500 in Week 3 of August 2017
Opening Round NAFTA Fissures Over the Meaning of “Substantial”: What’s the Best and Worst That Can Happen?