Billionaire investor Joe Ricketts, who is bankrolling his own super PAC, plans to be a big part of the fall ad war on the side of Mitt Romney and congressional Republicans. The Wall Street Journal: 

Joe Ricketts, the founder of what became online brokerage TD Ameritrade Inc., plans to spend $10 million airing ads supporting GOP nominee Mitt Romney and another $2 million to help Republicans running for Congress.

The ads will begin airing this week. The ads stack up as one of the biggest electioneering efforts by an individual in the 2012 election. National cable television spots will feature disaffected Obama supporters talking about why they plan to support Mr. Romney.

Ricketts was the subject of controversy earlier this year when the New York Times reported he was considering a multi-million dollar ad campaign aimed at tying President Obama to controversial comments made by his former pastor, Rev. Jeremiah Wright. 

Sean Sullivan has covered national politics for The Washington Post since 2012.