[TBBT]

National polls help build a narrative or conventional wisdom - justified or no. Once that happens a candidates coverage/face time dramatically increases. He/she becomes the hot topic on all the new shows and talk radio. Campaign contributions spike. The bandwagon effect takes hold. On and on - feeding on itself...

Next thing you know... Something call "Momentum" takes hold...

[TBBT]

Next thing you know... Something call "Momentum" takes hold...

All said - when you are trying to build momentum - you don't want to find yourself down in the polls (any poll - national or otherwise), especially if your numbers are dropping...

Perception is reality...