Hillary Clinton announced her presidential bid on Twitter. President Obama's White House has attempted to get around reporters by talking directly to the public via social media. And many political super PACs communicate only online.

Everybody's doing it, right? Well, no. There are 12 House members who don't even have campaign websites despite running for re-election, according to research from the University of Minnesota's Humphrey School of Public Affairs.

The school's "Smart Politics" team found a reason, though. Most won big in their previous elections. And they're old, such as California Democrat Rep. Maxine Waters, 76, and Kentucky Rep. Hal Rogers, 77. Other similarities:

• They are longtime members, averaging 11.2 terms.

• 10 of 12 are Democrats.

• 10 of 12 are non-white.

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at pbedard@washingtonexaminer.com.