A new Miami-based super PAC has surfaced with billboards opposing President Barack Obama in south Florida and plans to plant more in at least two other battleground states before Election Day. Backed by mostly Republican, pro-Israel activists, American Principles super PAC has spent about $220,000 so far and plans to spend $500,000 this election. 

It's one of a number of pop up super PACs that are emerging just before the November election, barraging voters with advertisements before having to reveal any information about financial backers. American Principles will release its first list of donors by Oct. 20 ...