The American Petroleum Institute (API) is a Big Oil lobby. Its president, Jack Gerard, is even rumored as a possible future chief of staff in Mitt Romney's White House.

API has big plans for both the Democratic and Republican National Conventions. The Tampa Bay Times reports that API plans to hold a music event outside the Republican convention featuring the Zac Brown Band:

The Grammy-winning country group, who sold out the 1-800-Ask-Gary Amphitheatre in January, will perform at a cruise ship terminal at the Port of Tampa during an event organized by the American Petroleum Institute. The nonpartisan event is part of API's Vote4Energy campaign, designed to urge leaders to invest in alternatives to foreign oil, including natural gas, nuclear energy and biofuels.

But Big Oil isn't just sticking with the party who treats it best. It also wants to influence the Democratic Party, and API spokeswoman Sabrina Fang said it will be hosting a similar concert event outside the Democratic convention in Charlotte.

For the show in Charlotte, API will be featuring O'Malley's March. O'Malley's March is a celtic rock band, and Maryland Democratic Governor Martin O'Malley -- who chairs the Democratic Governors Association and a possible candidate for the Democratic presidential nomination in 2016 -- was actually a guitarist, vocalist, and songwriter for the band from 1988 to 2005.

One has to wonder how O'Malley feels about his former bandmates joining Big Oil's cause, and if he will be making an appearance at this celebration of polluter-lobbyists.