It's hard not to see when you're attuned (some might say hypersensitive) to it.
A fresh example: would you know that Ron Paul polled the same as Mitt Romney in the latest Quinnipiac poll in New York from looking at RealClearPolitics here or here? But, he did:
"...and 5 percent each for Massachusetts Gov. Mitt Romney and Texas Congressman Ron Paul, according to a Quinnipiac University poll released today." [12/17/07]
(It's also worth noting that Paul's 5% is up from 1% in October, whereas Romney's is down from 7%.)
Yet how many other sites and news anchors will cite RealClearPolitics and, like them, leave out Ron Paul's tie with a "top tier" candidate (albeit near the bottom of the crowd, but above Tancredo and Duncan)? What is the cumulative effect of a thousand such slights?