By Judy Kurtz - 06/25/12 10:54 PM EDT
OVERHEARD: Sen. John McCain (R) adding some fuel to the fire of constant veepstakes buzz surrounding one of his colleagues.
Sen. Rob Portman (R-Ohio) was giving a group of interns a tour of the Capitol on Thursday when McCain breezed by.
Portman is said to be on Mitt Romney’s shortlist of potential running mates.
— Elise Viebeck and Jeremy Herb contributed to this report.