By contrast, there were four Democratic incumbents, who all won.

Three other Democratic incumbents chose not to run again.

And they know that the votes will also be difficult for Democratic incumbents in conservative locales.

Democratic incumbents held on to 17 seats, while Republicans won at least 13.

That, of course, is also good news for Democratic incumbents.

And there are, by most accounts, 6 to 10 vulnerable Democratic incumbents.

All other Democratic incumbents who were running also won.

Some Democratic incumbents who won re-election did the same.

Democratic incumbents raised $44.6 million in the last 15 months.

In two districts, pairs of Democratic incumbents were required to run against one another.