Don't be so sure it was Roman who outed them. In his phone call, he stated that he wanted to talk to someone about the event that happened. He didn't specifically state what event. The event could be a news report about Albie turning up in the hospital under a fictitious name, could be about the UEB meeting, could be about the guy that Bill bought out for his seat on the UEB. Does NOT have to be about Barb!!!
Think about it ... they made us think that it was Roman who was poisoning Bill's Dad w/the pitcher of iced tea and it turned out that it was Wanda who was doing it (that was a shocker!). And, remember most people thought that Sarah gave Rhonda the I-Pod, but Rhonda actually stole it from Sarah!!! They didn't make it crystal clear that Rhonda stole it ... but they didn't say that Sarah gave it to her, either. We had to wait quite a few episodes for clarity on that. And, we had to wait since episode 1 to find out that Roman wasn't poisoning Bill's dad. Who'da thought!?
I think that it was the neighbor who outed them. Why else would he be standing on the porch, watching to see what happened when they came home!? I mean, it's not like it was exposed on television or the newspaper.
Remember, at the awards ceremony when Barb admitted being plural, the First Lady said "What should we say?" and the guy said "Anything but the truth." Therefore, it's highly doubtful that the media is onto this. So, what would possess the neighbor to be standing on his porch watching them then!? Plus, the neighbor was onto "the braid" being plural ... so he must've called in on the entire family, figuring w/Margene breaking up w/his wife, that she was part of it, too.
Now, I could be totally wrong ... but I wouldn't be so fast to nail Roman! They've been tricky w/us thus far!