There's been a bit of confusion out there about supposed "ballots" that have been popping up in Pennsylvania today bearing the name of only one candidate.

Some alarmed readers have written in about them, suggesting voting irregularities. Others have made similar points in the blogosphere.

But these aren't irregularities at all, it turns out.

First, the visuals. Here's one that was sent to us by the Clinton campaign that only has Obama's name on it (click to enlarge)...

...and here's one, courtesy of Wonkette, with only Hillary's name on it (click to enlarge)...

Philly-resident Atrios has an explanation of what this is all about. These are not actual ballots. Rather, they are "sample ballots," handed out by a given candidate's supporters, basically telling voters who to vote for and how to vote for him or her.

To be clear, the Hillary campaign is not alleging irregularities around this. The Hillary camp sent over the Obama-only sample ballot only to clarify that this is happening on both sides and that it isn't irregular. The Obama campaign is not alleging irregularities around the Hillary-only sample ballot, either.