I say, bring it on.
Real Clear Politics has Michael Barone's column about this at this link. And here's a taste:
In 1994, I wrote an article in the U.S. News & World Report arguing that there was a serious chance that Republicans could capture the 40 seats that they needed then, as now, for a majority in the House. It was the first mainstream media piece suggesting that, and it appeared on the newsstands on July 11.
I cited as evidence five polls showing incumbent Democratic congressmen trailing Republican challengers. None of those Democrats had scandal problems; all five lost in November.
Today, a lot more Democratic incumbents seem to be trailing Republican challengers in polls. Jim Geraghty of National Review Online has compiled a list of 13 Democratic incumbents trailing in polls released over the last seven weeks.