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Monday's campaign round-up

<p>Today's installment of campaign-related news items that won't necessarily generate a post of their own, but may be of interest to

Today's installment of campaign-related news items that won't necessarily generate a post of their own, but may be of interest to political observers:

* In advance of the Wisconsin gubernatorial recall election, Gov. Scott Walker (R) doesn't want to tell anyone where his campaign headquarters is located. He also refuses to publish his daily schedule.

* Massachusetts Republicans expected to elect a slate of Mitt Romney delegates to the national convention over the weekend. That didn't happen -- Romney delegates, including Romney's former lieutenant governor, Kerry Healey -- lost to Ron Paul supporters.

* Sen. Marco Rubio (R-Fla.) was fined by the Federal Elections Commission for fairly minor campaign-finance irregularities during his 2010 campaign (thanks to reader G.B. for the tip).

* President Obama and former President Bill Clinton kicked off their first joint appearance yesterday.

* Romney campaigned in New Hampshire this morning with Sen. Kelly Ayotte (R), interpreted by many as a possible running-mate audition.

* In Massachusetts, Sen. Scott Brown (R) and Elizabeth Warren (D) released their tax returns on Friday. In a statement that indirectly makes Romney look bad, Brown's campaign manager said Warren is still "hiding something."

* In a new attack ad, the Romney campaign is trying to blame the Obama administration for the GSA conference controversy, which was uncovered by the Obama administration.

* And the Obama campaign unveiled a new video this morning, making the case for the president's re-election bid by highlighting his first-term accomplishments.