We've been told by the majority of the of the media that there was an anti-incumbent feeling nationwide. Lets look at some numbers.
In the house 43 incumbents lost their seats, 2 of them being Republican and 41 being Democrat. In the senate we also have none of the Republicans in the general election losing their seat compared to 6 of the Democrat seats lost (as of this writing, 2 yet to be determined).
The numbers don't look like an anti-incumbent feeling to me. They look like anti-Democrat.