Democrat John Kerry (search) plans to announce his vice presidential running mate in an e-mail to the 1 million subscribers to his campaign Web site.

But he didn't say when.

Kerry is expected to make the announcement before the July 26-29 Democratic National Convention (search). Typically, a presidential candidate announces a running mate at a carefully crafted campaign event.

But Kerry told KSTP, an ABC affiliate in Minneapolis, that his Web site would be the first vehicle.

"The folks who are going to learn first about my choice are going to be the people on JohnKerry.com," Kerry said. "They're the people who've helped carry this campaign. They're the folks who've been part of our effort across the nation. And they'll be the first to know what my decision is."

North Carolina Sen. John Edwards (search), Missouri Rep. Dick Gephardt, Florida Sen. Bob Graham and Iowa Gov. Tom Vilsack have been mentioned as possible running mates. Gov. Bill Richardson of New Mexico withdrew from consideration on Thursday.