Just three months ago, 34 House Democratic seats were considered competitive by the well-respected political handicapper Charlie Cook.
50 seats are now considered vulnerable.
Additionally, three months ago the margin of vulnerable Dem to GOP seats was only 22. And now that number is up to 40. Add in the seat of Jack Murtha and we're at +41.
Now, this doesn't mean Republicans will win all 50 Democrat-held competitive races. But, historically speaking, when the environment is as overwhelmingly friendly as Republicans are currently enjoying, massive sweeps do occur.
The times, they are a-changin'.