Political provocateur James O'Keefe, infamous for undercover stings purporting to show Democratic misdeeds, released a video on Twitter in which he said he was undercover in Philadelphia, looking for illegal activity and following "a pastor bus" that's taking voters to the polls. (In fact, the initial footage turned out to be from Indiana.)

The post was met with hundreds of angry tweets accusing O'Keefe of voter intimidation.

Tim O'Driscoll, a lawyer for the Republican City Committee, he saw "nothing illegal per se" in a church providing a bus to take voters to the polls.

"That has gone on from time immemorial," said Alan Kessler, an election lawyer at the Center City firm Duane Morris. "It's one thing if you're offering something of value. But helping people to get to the polls is something they've always done for people who are handicapped or in bad weather. I'd have a hard time seeing what the issue is."

District Attorney Seth Williams tweeted that it was not illegal to drive people to the polls, or to "drive around checking on polls."

Nearly an hour and a half after O'Keefe posted his video, Williams said his election fraud hotline was "still waiting" on a call from O'Keefe's group.

O'Keefe has been hitting back at Twitter users expressing skepticism about the video, telling them to wait until "the whole investigation from today" is released.

Hours later, O'Keefe released the "full pastor video" on Twitter. It turned out it wasn't filmed in Philadelphia at all -- rather, it showed footage of pastors in Indiana. O'Keefe did not explain why he had teased a video filmed in Indiana with footage from Pennsylvania.